GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Heated Seats System Check performed?

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Go to Step 2

Go to Heated Seats System Check

2

  1. Disconnect the heated seat switch connector.
  2. Connect a fused jumper from battery positive voltage (B+) to the heated seat switch cavity B.
  3. Connect a fused jumper from ground to the heated seat switch cavity D.

Does the high heat LED light?

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Go to Step 3

Go to Step 7

3

  1. Disconnect the front heated seat module connector C1 or the rear door module connector C1.
  2. Perform the appropriate procedure:
  3. • Front: Connect a DMM from the front heated seat module connector C1 cavity F (WHT) to the front heated seat switch connector cavity B (DK GRN) (LH) or (YEL) (RH).
    • Rear: Connect a DMM from the rear door module connector C1 cavity 13 (BLK/WHT) to the rear heated seat switch connector cavity A (BLK/WHT).

Is the resistance less than the specified value?

5 ohms

Go to Step 4

Go to Step 8

4

Is the inoperative LED for the front seat?

--

Go to Step 5

Go to Step 6

5

Replace the front heated seat module. Refer to Heater Module Replacement .

Is the front heated seat module replacement complete?

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Go to Heated Seats System Check

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6

Replace the rear door module. Refer to Door Control Module Replacement in Doors.

Is the rear door module replacement complete?

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Go to Heated Seats System Check

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7

Replace the heated seat switch. Refer to Front Seat Heater Switch Replacement or Door Trim Panel Replacement in Doors.

Is the heated seat switch replacement complete?

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Go to Heated Seats System Check

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8

Repair the suspect wiring:

    • LH front: CKT 1661 (DK GRN).
    • RH front: CKT 1685 (YEL).
    • LH rear: CKT 1638 (BLK/WHT).
    • RH rear: CKT 1635 (BLK/WHT).

Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

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Go to Heated Seats System Check

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