Pinpoint Test U: The Heated Seat is Inoperative - Front Passenger Seat Does Heat But the Heated Seat Indicator Does Not Illumin
Seats
Pinpoint Tests
Pinpoint Test U: The Heated Seat is Inoperative - Front Passenger Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
Upon receiving a signal from the HVAC module, the heated seat module will decrease one setting (the sequence is hi, lo, OFF, hi, etc.). When the passenger heated seat is set to hi, both LED indicators above the passenger heated seat control button will illuminate. When the passenger heated seat is set to lo, only the left LED on the passenger heated seat indicator will illuminate. When the passenger heated seat is set to OFF, neither passenger heated seat LED will illuminate.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat module
- HVAC module
PINPOINT TEST U: THE HEATED SEAT IS INOPERATIVE - FRONT PASSENGER SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED
WARNING: Never install heated seat parts not intended for use on this vehicle. Parts released for other model years or vehicle lines are not compatible even if they appear visually and physically similar. Installing incorrect parts will result in heated seat system performance outside design specification. Failure to follow this instruction may result in serious personal injury.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition 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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U1 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) 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 C327.
- Disconnect: HVAC Module C228b.
- Disconnect: Heated Seat Module C329.
- 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:
- HVAC module C228b-4, circuit CHS09 (GY), harness side and ground.
- HVAC module C228b-5, circuit CHS14 (GN), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to U2.
No
REPAIR the affected circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C327.
REPOWER the SRS. REFER to Restraint Systems.
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U2 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) FOR AN OPEN
- Measure the resistance between:
- HVAC module C228b-4, circuit CHS09 (GY), harness side and heated seat module C329-3, circuit CHS09 (GY), harness side.
- HVAC module C228b-5, circuit CHS14 (GN), harness side and heated seat module C329-6, circuit CHS14 (GN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to U3.
No
REPAIR the affected circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C327.
REPOWER the SRS. REFER to Restraint Systems.
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U3 CHECK THE HEATED SEAT MODULE HI INDICATOR ON THE HVAC MODULE
- Connect: HVAC Module C228b.
- Ignition ON.
- Connect a fused jumper lead between heated seat module C329-6, circuit CHS14 (GN), harness side and C329-1, circuit SBB16 (VT/RD), harness side.
- Does the right passenger heated seat indicator LED illuminate on the HVAC module?
Yes
GO to U4.
No
INSTALL a new HVAC module. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C327.
REPOWER the SRS. REFER to Restraint Systems.
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U4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE HVAC MODULE
- Connect a fused jumper lead between passenger heated seat module C329-3, circuit CHS09 (GY), harness side and C329-1, circuit SBB16 (VT/RD), harness side.
- Does the left passenger heated seat indicator LED illuminate on the HVAC module?
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 side air bag module C327.
REPOWER the SRS. REFER to Restraint Systems.
No
INSTALL a new HVAC module. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C327.
REPOWER the SRS. REFER to Restraint Systems.
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