Pinpoint Test W: The Heated Seat Does Not Operate Correctly - Left Rear Seat Does Heat But The Heated Seat Indicator Does Not I

Seats

Pinpoint Tests

Pinpoint Test W: The Heated Seat Does Not Operate Correctly - Left Rear 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

Pressing the left rear heated seat switch once in either the high or low mode will commanded on the left rear heated seat. Voltage is then supplied to the left rear heated seat switch from the heated seat module on either circuit CHS48 (YE) (high heat mode) or circuit CHS49 (VT) (low heat mode) illuminating the switch indicator. Pressing the left rear heated seat switch again in the mode that is currently on will set the left rear heated seat to off and also turn that LED off.

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



PINPOINT TEST W: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - LEFT REAR SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED

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W1 CHECK THE REAR HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND


- Disconnect: Left Rear Heated Seat Switch C3340.
- Disconnect: Heated Seat Module C3162.
- Measure the resistance between:
- heated seat module C3162-5, circuit CHS49 (VT), harness side and ground.
- heated seat module C3162-4, circuit CHS48 (YE), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to W2.

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

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W2 CHECK THE REAR HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN


- Measure the resistance between:
- left rear heated seat switch C3340-3, circuit CHS49 (VT), harness side and heated seat module C3162-5, circuit CHS49 (VT), harness side.
- left rear heated seat switch C3340-4, circuit CHS48 (YE), harness side and heated seat module C3162-4, circuit CHS48 (YE), harness side.




- Are the resistances less than 5 ohms?

Yes
GO to W3.

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

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W3 CHECK THE REAR HEATED SEAT HIGH INDICATOR


- Connect: Left Rear Heated Seat Switch C3340.
- Ignition ON.
- Connect a fused jumper lead between heated seat module C3162-4, circuit CHS48 (YE), harness side and C3162-1, circuit SBB05 (GY/RD), harness side.




- Does the high indicator LED illuminate on the left rear heated seat switch?

Yes
GO to W4.

No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear Heated Seat Switch - Rear. TEST the system for normal operation.

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W4 CHECK THE REAR HEATED SEAT LOW INDICATOR


- Connect a fused jumper lead between heated seat module C3162-5, circuit CHS49 (VT), harness side and C3162-1, circuit SBB05 (GY/RD), harness side.




- Does the low indicator LED illuminate on the left rear heated seat switch?

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

No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear Heated Seat Switch - Rear. TEST the system for normal operation.

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