Pinpoint Test Q: The Heated Seat Does Not Operate Correctly - Front Passenger Seat Does Heat But The Heated Seat Indicator Does

Seats

Pinpoint Tests

Pinpoint Test Q: The Heated Seat Does Not Operate Correctly - Front Passenger Seat Does Heat but the Heated Seat Indicator Does Not Illuminate

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 high, low, off, high, etc.). Circuits CHS09 (GY) and CHS14 (GN) between the heated seat module and HVAC module supply the control signals for the indicators to operate. When a heated seat is set to high, both LED indicators above the heated seat control button will illuminate. When a heated seat is set to low, only the left LED indicator will illuminate. When a heated seat is set to off, neither LED will be illuminated.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat module
- HVAC module



PINPOINT TEST Q: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - FRONT PASSENGER SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE

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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Q1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C3227.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: HVAC Module C228b.
- Disconnect: Heated Seat Module C3304.
- 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.
- 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 resistances greater than 10,000 ohms?

Yes
GO to Q2.

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

DISCONNECT the battery ground cable.

CONNECT passenger seat side air bag module C3227.

CONNECT passenger seat safety belt buckle pretensioner C3066.

REPOWER the SRS. REFER to Air Bag Systems.

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Q2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN


- Measure the resistance between:
- HVAC module C228b-4, circuit CHS09 (GY), harness side and heated seat module C3304-3, circuit CHS09 (GY), harness side.
- HVAC module C228b-5, circuit CHS14 (GN), harness side and heated seat module C3304-6, circuit CHS14 (GN), harness side.




- Are resistances less than 5 ohms?

Yes
GO to Q3.

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

DISCONNECT the battery ground cable.

CONNECT passenger seat side air bag module C3227.

CONNECT passenger seat safety belt buckle pretensioner C3066.

REPOWER the SRS. REFER to Air Bag Systems.

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Q3 CHECK THE HEATED SEAT MODULE HIGH INDICATOR


- Connect: HVAC Module C228b.
- Ignition ON.
- Connect a fused jumper lead between heated seat module C3304-6, circuit CHS14 (GN), harness side and C3304-1, circuit SBB22 (BN/RD), harness side.




- Do both indicators illuminate indicating high mode?

Yes
GO to Q4.

No
INSTALL a new HVAC module. TEST the system for normal operation.

DISCONNECT the battery ground cable.

CONNECT passenger seat side air bag module C3227.

CONNECT passenger seat safety belt buckle pretensioner C3066.

REPOWER the SRS. REFER to Air Bag Systems.

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Q4 CHECK THE HEATED SEAT MODULE LOW INDICATOR


- Connect a fused jumper lead between heated seat module C3304-3, circuit CHS09 (GY), harness side and C3304-1, circuit SBB22 (BN/RD), harness side.




- Does only indicator illuminate indicating low mode?

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 C3227.

CONNECT passenger seat safety belt buckle pretensioner C3066.

REPOWER the SRS. REFER to Air Bag 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 C3227.

CONNECT passenger seat safety belt buckle pretensioner C3066.

REPOWER the SRS. REFER to Air Bag Systems.

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