Pinpoint Test C: The Heated Seat is Inoperative/Does Not Operate Correctly - Passenger
Seats
Pinpoint Test C: The Heated Seat is Inoperative/Does Not Operate Correctly - Passenger
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information Electrical Diagrams.
Normal Operation
The heated seat system only operates when the engine is running. When the passenger heated seat switch (located on the instrument panel) is activated, it supplies a ground signal to the Body Control Module (BCM). When the BCM (Body Control Module) receives the heated seat switch signal, it activates the passenger heated seat relay (located in the Central Junction Box (CJB)) by grounding the relay control circuit. When the heated seat relay is activated, voltage is supplied to the passenger cushion heater mat. The passenger cushion heater mat is directly connected to ground to complete the electrical circuit to heat the seat.
- DTC B1036:12 (Right Front Seat Heater Element: Circuit Short To Battery)- if the passenger heated seat relay drive circuit CHS07 (GY/BU) is shorted to voltage and the BCM (Body Control Module) attempts to activate the passenger heated seat relay, this DTC sets and the seat fails to heat.
- DTC B1036:14 (Right Front Seat Heater Element: Circuit Short To Ground or Open)- if the passenger heated seat relay drive circuit CHS07 (GY/BU) is open or shorted to ground and the BCM (Body Control Module) attempts to activate the passenger heated seat relay, this DTC sets and the seat fails to heat (circuit open) or may be on at all times (circuit shorted to ground) until the ignition is turned OFF.
- DTC B115A:23 (Front Passenger Seat Heater: Signal Stuck Low)- sets when the BCM (Body Control Module) detects the passenger heated seat switch is active during on-demand self-test or has been active for more than 2 minutes.
This pinpoint test is intended to diagnose the following:
- Heated seat relay
- Heated seat switch
- Wiring, terminals or connectors
- Heater mat
- BCM (Body Control Module)
PINPOINT TEST C : THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - PASSENGER
NOTE: If a seat equipped with a seat mounted side air bag is being serviced, depower the Supplemental Restraint System (SRS). Refer to Restraints and Safety Systems &/or Air Bag Systems.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS (Supplemental Restraint System) fault.
NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.
C1 CHECK THE BCM (Body Control Module) FOR DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- BCM (Body Control Module).
Is DTC B1036:12, B1036:14 or B115A:23 retrieved?
Yes
If DTC B1036:14 is present, GO to C7.
If DTC B1036:12 is present, GO to C6.
If DTC B115A:23 is present, GO to C4.
For all other BCM (Body Control Module) DTCs, REFER to the Master DTC Chart in Body Control Systems Body Control Systems.
No
GO to C2.
C2 CHECK THE BCM (Body Control Module) PASSENGER HEATED SEAT (CC_SW_P_HSEATS) PID OPERATION
- Enter the following diagnostic mode on the scan tool: DataLogger- BCM (Body Control Module).
- While monitoring the BCM (Body Control Module) CC_SW_P_HSEATS PID, press and release the passenger heated seat switch.
Does the PID agree with the passenger heated switch status?
Yes
GO to C9.
No
GO to C3.
C3 CHECK THE PASSENGER HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Passenger Heated Seat/Ambient Lighting Switch C2401.
- Measure the resistance between passenger heated seat/ambient lighting switch C2401-4, circuit GD115 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to C4.
No
REPAIR the circuit. TEST the system for normal operation.
C4 CHECK THE BCM (Body Control Module) PASSENGER HEATED SEAT (CC_SW_P_HSEATS) PID OPERATION
- Ignition OFF.
- Disconnect: Passenger Heated Seat/Ambient Lighting Switch C2401.
- Connect a fused jumper wire between passenger heated seat/ambient lighting switch C2401-4, circuit GD115 (BK/GY), harness side and passenger heated seat/ambient lighting switch C2401-6, circuit CHS30 (GY/YE), harness side.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- BCM (Body Control Module).
- Observe the BCM (Body Control Module) CC_SW_P_HSEATS PID status.
- Remove the fused jumper wire.
- Observe the BCM (Body Control Module) CC_SW_P_HSEATS PID status.
Did the PID state change when the fused jumper wire was removed?
Yes
INSTALL a new passenger heated seat/ambient lighting switch. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to C5.
C5 CHECK THE PASSENGER HEATED SWITCH SIGNAL CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280G.
- Measure the resistance between passenger heated seat/ambient lighting switch C2401-6, circuit CHS30 (GY/YE), harness side and BCM (Body Control Module) C2280G-21, harness side; and between passenger heated seat/ambient lighting switch C2401-6, circuit CHS30 (GY/YE), harness side and ground.
Is the resistance less than 5 ohms between the heated seat switch and the BCM (Body Control Module) ; and greater than 10,000 ohms between the heated seat switch and ground?
Yes
GO to C13.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C6 CHECK THE RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay.
- Ignition ON.
- Measure the voltage between passenger heated seat relay socket pin 2, circuit CHS07 (GY/BU), harness side and ground.
Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
INSTALL a new passenger heated seat relay. RECONNECT all connectors and REPEAT the self-test. If the DTC is retrieved again, GO to C13.
C7 CHECK THE RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay.
- Disconnect: BCM (Body Control Module) C2280D.
- Measure the resistance between passenger heated seat relay socket pin 2, circuit CHS07 (GY/BU), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to C8.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C8 CHECK THE RELAY CONTROL CIRCUIT FOR AN OPEN
- Measure the resistance between passenger heated seat relay socket pin 2, circuit CHS07 (GY/BU), harness side and BCM (Body Control Module) C2280D-4, circuit CHS07 (GY/BU), harness side.
Is the resistance less than 5 ohms?
Yes
INSTALL a new passenger heated seat relay. RECONNECT all connectors and REPEAT the self-test. If the DTC is retrieved again, GO to C13.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C9 CHECK FOR VOLTAGE TO THE PASSENGER HEATED SEAT RELAY
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay.
- Ignition ON.
- Measure the voltage between passenger heated seat relay socket pin 1, circuit CBP17 (BN/GN) and ground; and between passenger heated seat relay socket pin 3, circuit CBP17 (BN/GN) and ground.
Is the voltage greater than 10 volts for both measurements?
Yes
GO to C10.
No
VERIFY Central Junction Box (CJB) fuse 17 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C10 CHECK THE HEATER MAT CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Connect: Passenger Heated Seat Relay.
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraints and Safety Systems &/or Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag Module C337.
- Disconnect: Passenger Seat Cushion Heater C334.
- 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.
- Start the engine.
- Activate the passenger heated seat switch and measure the voltage between passenger seat cushion heater C334-1, circuit CHS12 (YE/GN), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to C12.
No
GO to C11.
C11 CHECK THE HEATER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay.
- Measure the resistance between passenger heated seat relay socket pin 5, circuit CHS12 (YE/GN), harness side and passenger seat cushion heater C334-1, circuit CHS12 (YE/GN), harness side.
Is the resistance less than 5 ohms?
Yes
GO to C14.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C337.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
C12 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between passenger seat cushion heater C334-2, circuit GD145 (BK/BU), harness side and ground.
Is the resistance less than 5 ohms?
Yes
CHECK for loose or damaged connector pins and wiring damage. If OK, INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion - Front Seat Cushion - Front. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C337.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C337.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
C13 CHECK THE BCM (Body Control Module) FOR CORRECT OPERATION
- Ignition OFF.
- Disconnect all of the BCM (Body Control Module) connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all of the BCM (Body Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C14 CHECK THE BCM (Body Control Module) FOR CORRECT OPERATION
- Ignition OFF.
- Disconnect all of the BCM (Body Control Module) connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all of the BCM (Body Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C337.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C337.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.