The seat cool temperature switch is normally open. When the switch is pressed, it momentarily sends a 12-volt signal through the cool temperature switch signal circuit to the door control module. The door module then sends the cooled seat request to the heated/cooled seat module (CCSM). In response to this signal, the heated/cooled seat module activates the cooled seat mode.
This diagnostic procedure supports the following DTC:
DTC B3642 Seat Cooler Switch Circuit
The door module must be powered and cannot have B1327 - Battery Voltage Low or B1328 - Battery Voltage High set as an active DTC for this DTC to set.
If the door module detects that the seat cool temperature switch input circuit is active for 30 continuous seconds, the switch will be considered shorted and the DTC will set.
No other heated/cooled seat switch activations shall be recognized as a result of this switch circuit being active.
The DTC automatically clears when the switch circuit setting the DTC is no longer active.
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Connector End Views or Power Door Systems Connector End Views in Doors | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the Seat Cool Mode Switch parameter display OFF? | Go to Step 3 | Go to Step 4 | |
3 |
Does the Seat Cool Mode Switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 |
Does the Seat Cool Mode Switch parameter display OFF? | Go to Step 7 | Go to Step 5 |
5 | Test the seat cool temperature switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the heated/cooled seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the heated/cooled seat switch. Refer to Heated and Cooled Seat Switch Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |