Pinpoint Test W: The Heated Seat Is Inoperative/Does Not Operate Correctly- Front Passenger

Seats

Pinpoint Tests

Pinpoint Test W: The Heated Seat is Inoperative/Does Not Operate Correctly- Front Passenger

Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number

Normal Operation

The heated seat module receives ignition voltage, battery voltage and ground. The HVAC module supplies a momentary ground signal to the heated seat module on circuit CHS30 to request the system ON or OFF. The heated seat module supplies voltage to the heater mats on circuit CHS07 and ground is supplied on circuit GD904. The cushion and backrest heater mats are connected in series and operate together. The heated seat module supplies a reference voltage to the temperature sensor on circuit VHS27 and return on RHS05.

The Front Controls Interface Module (FCIM) and the HVAC module communicate on the Controller Area Network (CAN) and PIDs are available to check heated seat switch operation in both modules.

The heated seat module faults detected will be:

- a heater feed circuit short to battery, ground or open.
- sensor circuit short to battery or open.
- heated seat switch stuck closed to ground.

The HVAC module reports the following DTCs for the passenger heated seat. These DTCs are for request circuit CHS30.

- DTC B1032:11 (Right Front Seat Heater: Circuit Short To Ground) - If the passenger seat request circuit from the HVAC module to the heated seat module is shorted to ground, the DTC is set.
- DTC B1032:12 (Right Front Seat Heater: Circuit Short To Battery) - If the passenger seat control circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set.
- DTC B1032:13 (Right Front Seat Heater: Circuit Open) - If the passenger seat control circuit from the HVAC module to the heated seat module is open, the DTC is set.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Heater feed circuit short to battery, ground or open
- Sensor circuit short to battery, ground or open
- Heater mat
- Heated seat module
- HVAC module
- FCIM

PINPOINT TEST W: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - FRONT PASSENGER

NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

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W1 CHECK FOR HEATED SEAT INDICATOR ILLUMINATION

- Start the engine.
- Verify system indicator illumination.
- Do the passenger heated seat indicators illuminate or flash and then turn off?

Yes
GO to W7.

No
GO to W2.

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W2 RETRIEVE THE FCIM DTCs

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any FCIM DTCs retrieved?

Yes
For all FCIM DTCs, REFER to the Master DTC Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart

No
GO to W3.

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W3 RETRIEVE THE HVAC MODULE DTCs

- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Are any HVAC module DTCs retrieved?

Yes
If DTC B1032:12, GO to W21.

If DTC B1032:13, GO to W22.

If DTC B1032:11, GO to W23.

For any other HVAC module DTCs, REFER to the HVAC Module DTC Chart. HVAC Module DTC Chart

No
For vehicles with navigation, GO to W4

For vehicles without navigation, GO to W5.

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W4 MONITOR THE PASSENGER HEATED SEAT (CC_SW_P_HSEATS) PID AND CHECK THE INPUTS

- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.
- Monitor the CC_SW_P_HSEATS PID while pushing the passenger heated seat button.
- Do the PID states agree with the switch button positions?

Yes
INSTALL a new HVAC module. TEST the system for normal operation.

No
INSTALL a new FCIM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.

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W5 CHECK THE HVAC FUNCTIONS

NOTE: The purpose of this step is to verify the HVAC module is able to receive and process inbound command messages from the communication bus and demonstrate the HVAC module is operational. This indicates the heated seat buttons on the FCIM may not be sending the commands.

- Operate the A/C, heater and defrost using the buttons on the FCIM and check for correct HVAC function.
- Does the HVAC system function correctly?

Yes
GO to W6.

No
REFER to Heating and Air Conditioning to diagnose the HVAC concern.

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W6 MONITOR THE HVAC MODULE RIGHT SEAT HEATER (ST_HEAT_RT) PID AND CHECK THE INPUTS

- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC Module - PIDs.
- Monitor the ST_HEAT_RT PID while pushing the passenger heated seat button.
- Do the PID values agree with the switch button positions?

Yes
The fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose connector pins. CLEAR the DTCs. REPEAT the self-test. CHECK the system for normal operation.

No
INSTALL a new FCIM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.

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W7 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General
Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359B.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
- Connect the battery ground cable. Refer to Battery.
- Ignition ON.
- Measure the voltage between:
- heated seat module C359B-2, circuit SBX06 (GY/RD), harness side and ground.
- heated seat module C359B-3, circuit CBX01 (GN//RD), harness side and ground.

- Are the voltages greater than 10 volts?

Yes
GO to W8.

No
VERIFY Smart Junction Box (SJB) fuse 35 (10A) and Battery Junction Box (BJB) fuse 22 (30A) are OK. If OK, REPAIR the affected circuit. If not OK,
REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W8 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.
- Measure the resistance between heated seat module C359B-5, circuit GD903 (BK/WH), harness side and ground.

- Is the resistance less than 5 ohms?

Yes
GO to W9.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W9 CHECK THE HEATER MAT OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition ON.
- Measure the voltage between heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground.

- Repeat the resistance measurement between heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground with an occupant or weight on the seat and check for an intermittent open.
- Is the resistance between 1.2 and 4 ohms?

Yes
GO to W17.

No
GO to W11.

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W11 CHECK THE CUSHION HEATER MAT OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND

- Disconnect: Passenger Seat Cushion Heater Mat C334.
- Measure the resistance between:
- heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and passenger seat cushion heater mat C334-1, circuit CHS07 (GY/BU), harness side.
- heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground.

- Is the resistance less than 5 ohms between C359B-6 and C334-1, and greater than 10,000 ohms between C359B-6 and ground?

Yes
GO to W12.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W12 CHECK THE CUSHION HEATER MAT FOR AN OPEN

- Measure the resistance between passenger seat cushion heater mat C334 pins 1 and 4, component side.

- Is the resistance between 0.6 and 2 ohm?

Yes
GO to W13.

No
INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W13 CHECK THE CUSHION HEATER MAT FOR AN OPEN

- Carry out the following measurements with an occupant in the seat and check for an open heater mat with weight on the seat.
- Measure the resistance between passenger seat cushion heater mat C334 pins 1 and 4, component side.

- Is the resistance between 0.6 and 2 ohm?

Yes
GO to W14.

No
INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W14 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND

- Disconnect: Passenger Seat Backrest Heater Mat C335.
- Measure the resistance between:
- seat cushion heater mat C334-4, circuit CHS01 (GY/VT), harness side and seat backrest heater mat C335-1, circuit CHS01 (GY/VT) harness side.
- seat cushion heater mat C334-4, circuit CHS01 (GY/VT), harness side and ground.

- Is the resistance less than 5 ohms between C334-4 and C335-1, and greater than 10,000 ohms between C334-4 and ground?

Yes
GO to W15.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W15 CHECK THE BACKREST HEATER MAT FOR AN OPEN

- Measure the resistance between passenger seat backrest heater mat C335 pins 1 and 2, component side.

- Is the resistance between 0.6 and 2 ohm?

Yes
GO to W16.

No
INSTALL a new passenger seat backrest heater mat. REFER to Seat Backrest Heater Mat - Front Seat Backrest Heater Mat - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W16 CHECK THE BACKREST HEATER MAT FOR AN OPEN

- Carry out the following measurements with an occupant in the seat and check for an open heater mat with weight on the seat.
- Measure the resistance between passenger seat backrest heater mat C335 pins 1 and 2, component side.

- Is the resistance between 0.6 and 2 ohm?

Yes
REPAIR circuit GD904 (BK/BU) for an open. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
INSTALL a new passenger seat backrest heater mat. REFER to Seat Backrest Heater Mat - Front Seat Backrest Heater Mat - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W17 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Disconnect: Heated Seat Module C359A.
- Disconnect: Passenger Seat Cushion Heater Mat C334.
- Ignition ON.
- Measure voltage between heated seat module C359A-9, circuit VHS27 (WH/OG), harness side and ground.

- Is any voltage present?

Yes
REPAIR the circuit. GO to W19 to check the temperature sensor for damage. If OK, TEST the system for normal operation. If not OK, INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
GO to W18.

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W18 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND

- Ignition OFF.
- Measure the resistance between:
- heated seat module C359A-9, circuit VHS27 (WH/OG), harness side and seat cushion heater mat C334-2, circuit VHS27 (WH/OG), harness side.
- heated seat module C359A-9, circuit VHS27 (WH/OG), harness side and ground.

- Is the resistance less than 5 ohms between C359A-9 and C334-2, and greater than 10,000 ohms between C359A-9 and ground?

Yes
GO to W19.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W19 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN

- Measure the resistance between heated seat module C359A-12, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater mat C334-3, circuit RHS05 (YE/VT), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to W20.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W20 CHECK THE TEMPERATURE SENSOR FOR AN OPEN

- Ignition OFF.
- Measure the resistance between heated seat cushion C334 pin 2 and 3 component side.

- Repeat the resistance measurement between heated seat cushion C334 pins 2 and 3 component side with an occupant or weight on the seat and check for an intermittent open.
- Is the resistance between 300 ohms and 300,000 ohms?

Yes
GO to W24.

No
INSTALL a new cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W21 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General
Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359A.
- Disconnect: HVAC Module C228A.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
- Connect the battery ground cable. Refer to Battery.
- Ignition ON.
- Measure voltage between heated seat module C3304A-8, circuit CHS30 (GY/YE), harness side and ground.

- Is any voltage present?

Yes
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W22 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR AN OPEN

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General
Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359A.
- Disconnect: HVAC Module C228A.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
- Connect the battery ground cable. Refer to Battery.
- Measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and HVAC module C228A-10, circuit CHS30 (GY/YE), harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W23 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General
Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359A.
- Disconnect: HVAC Module C228A.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
- Connect the battery ground cable. Refer to Battery.
- Measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground.

- Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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W24 CHECK THE HVAC MODULE OUTPUT

- Connect: Heated Seat Module C359A and C359B.
- Ignition ON.
- NOTE: The following measurement must be taken by back-probing heated seat module C359A.
- NOTE: Voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat control button is pressed.
- Measure voltage between passenger heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground by back-probing the heated seat module connector. Press the passenger heated seat button on the HVAC module and note the voltage.

- Is the voltage greater than 10 volts before pressing the passenger heated seat control button, then momentarily drops when the heated seat control button is pressed?

Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

No
If voltage is greater than 10 volts but did not drop when the passenger heated seat button was pressed, INSTALL a new HVAC module. TEST the system for normal operation.

If voltage is less than 10 volts, INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS. REFER to Restraint Systems.

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