Pinpoint Test L: The Heated Seat Is Inoperative - Passenger
Seats
Pinpoint Tests
Pinpoint Test L: The Heated Seat is Inoperative - Passenger
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The heated seat module is supplied battery and switched ignition voltage. The heated seat is activated when the heated seat switch supplies a ground signal to one of 2 input circuits into the heated seat module. One circuit activates the system to hi or off. The other circuit activates the system to low or off. Once activated, the heated seat module supplies voltage and ground to the heater mat to heat the seat cushion and backrest. The heated seat module monitors the temperature sensor in the cushion heater mat to maintain the seat temperature. The system will remain on until the module times-out or is switched off.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Heated seat switch
- Heater mat
- Heated seat module
PINPOINT TEST L: THE HEATED SEAT IS INOPERATIVE - PASSENGER
WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTICE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: The heater mat on the front passenger seat cushion is not serviceable separately. If a new heater mat is needed on the front passenger seat cushion, a new Occupant Classification Sensor (OCS) system service kit and a new heater mat must be installed. Refer to Supplemental Restraint System Service and Repair.
NOTE: If a passenger seat backrest heater mat is faulty, a new foam pad must be installed with the new heater mat. Do not reuse the original foam pad.
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L1 CHECK THE HEATED SEAT SWITCH AND CIRCUIT RESISTANCE
- Ignition OFF.
- Depower the Supplemental Restraint System (SRS). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Seat Side Air Bag C316.
- Connect: Restraint System Diagnostic Service Tool to Passenger Seat Side Air Bag C316.
- Disconnect: Passenger Heated Seat Module C329.
- Measure resistance between passenger heated seat module C329-8, circuit 581 (RD), and C329-11, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
- Are the resistances less than 5 ohms when the heated seat switch is pressed?
Yes
GO to L3.
No
GO to L2.
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L2 CHECK THE PASSENGER HEATED SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Passenger Heated Seat Switch C630.
- Measure resistance between passenger heated seat switch C630-1, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new heated seat switch. REFER to Heated Seat Switch Heated Seat Switch. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L3 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE
- Ignition OFF.
- 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, Mounting and Cables Battery Disconnect.
- Measure voltage between passenger heated seat module C329-12, circuit 1048 (LB/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to L4.
No
VERIFY the Battery Junction Box (BJB) fuse 16 (20A) is OK. If OK, REPAIR the 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. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L4 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE
- Ignition ON.
- Measure voltage between passenger heated seat module C329-5, circuit 1040 (RD/BK), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to L5.
No
VERIFY the Central Junction Box (CJB) fuse 17 (10A) is OK. If OK, REPAIR the 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. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L5 CHECK THE PASSENGER HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure resistance between passenger heated seat module C329-1, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to L6.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L6 CHECK THE HEATER CIRCUIT RESISTANCE AND FOR A SHORT TO GROUND
- Measure resistance between:
- passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and C329-7, circuit 1065 (WH/LB), harness side.
- passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground.
- Is the resistance between 1.6 ohms and 10 ohms between C329-6 and C329-7 and greater than 10,000 ohms between C329-6 and ground?
Yes
GO to L7.
No
GO to L12.
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L7 CHECK THE HEATERS AND CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure voltage between:
- passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground.
- passenger heated seat module C329-7, circuit 1065 (WH/LB), harness side and ground.
- Is voltage present on either circuit?
Yes
REPAIR the circuit(s). TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to L8.
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L8 CHECK TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE
- Measure voltage between:
- passenger heated seat module C329-3, circuit 1061 (BN/LB), harness side and ground.
- passenger heated seat module C329-4, circuit 1060 (BK/LB), harness side and ground.
- Is voltage present on either circuit?
Yes
REPAIR the circuit(s). TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to L9.
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L9 CHECK TEMPERATURE SENSOR CIRCUITS RESISTANCE AND FOR A SHORT TO GROUND
- Ignition OFF.
- Measure resistance between:
- passenger heated seat module C329-3, circuit 1061 (BN/LB), harness side and C329-4, circuit 1060 (BK/LB), harness side.
- passenger heated seat module C329-3, circuit 1061 (BN/LB), harness side and ground.
- Is the resistance between 50 ohms and 300,000 ohms between C329-3 and C329-4 and greater than 10,000 ohms between C329-3 and ground?
Yes
INSTALL a new passenger heated seat module. REFER to Heated Seat Module Heated Seat Module. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to L10.
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L10 CHECK THE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Disconnect: Passenger Seat Cushion Heater C334.
- Measure resistance between:
- passenger heated seat module C329-3, circuit 1061 (BN/LB), harness side and passenger seat cushion heater C334-2, circuit 1061 (BN/LB), harness side.
- passenger heated seat module C329-3, circuit 1061 (BN/LB), harness side and ground.
- Is the resistance less than 5 ohms between the heated seat module and seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
Yes
GO to L11.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L11 CHECK THE SENSOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Measure resistance between:
- passenger heated seat module C329-4, circuit 1060 (BK/LB), harness side and passenger seat cushion heater C334-3, circuit 1060 (BK/LB), harness side.
- passenger heated seat module C329-4, circuit 1060 (BK/LB), harness side and ground.
- Is the resistance less than 5 ohms between the heated seat module and seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
Yes
INSTALL a new passenger seat cushion heater. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L12 CHECK THE HEATER POWER FEED CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Disconnect: Passenger Seat Cushion Heater C334.
- Measure resistance between:
- passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and passenger seat cushion heater C334-4, circuit 1064 (YE/LB), harness side.
- passenger heated seat module C329-6, circuit 1064 (YE/LB), harness side and ground.
- Is the resistance less than 5 ohms between the heated seat module and seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
Yes
GO to L13.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L13 CHECK THE HEATER RETURN FEED CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Measure resistance between:
- passenger heated seat module C329-7, circuit 1065 (WH/LB), harness side and passenger seat cushion heater C334-1, circuit 1065 (WH/LB), harness side.
- passenger heated seat module C329-7, circuit 1065 (WH/LB), harness side and ground.
- Is the resistance less than 5 ohms between the heated seat module and seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
Yes
GO to L14.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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L14 CHECK THE SEAT BACK HEATER RESISTANCE
- Disconnect: Passenger Seat Back Heater C335.
- Measure resistance between passenger seat back heater C335 pin 1 and pin 2, component side.
- Is the resistance between 0.6 and 0.9 ohm?
Yes
INSTALL a new passenger seat cushion heater. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
INSTALL a new passenger seat back heater. TEST the system for normal operation.
DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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