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Home >> Chevy Truck >> 2009 >> Traverse AWD V6-3.6L >> Repair and Diagnosis >> Body and Frame >> Seats >> Seat Temperature Element >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Heated Seat Inoperative >> With Memory A45

With Memory A45




Heated Seat Inoperative (With Memory A45)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

Diagnostic Fault Information





Circuit/System Description

The driver and front passenger heated seats are controlled by separate heated seat switches. When a heated seat switch is pressed, ground is momentarily applied through the switch contacts and the switch signal circuit to the door switch. In response to this signal, the door switch sends serial data a message to the memory seat module (MSM) indicating the heat seat request. The door switch then applies voltage through the appropriate indicator control circuits to the heated seat switch illuminating the indicators.

Reference Information
Schematic Reference

Heated/Cooled Seat Schematics (Except A45) (Except A45)Heated/Cooled Seat Schematics (A45 with KA1) (A45 with KA1)Heated/Cooled Seat Schematics (A45 with KB6) (A45 with KB6)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Heated Seats Description and Operation (Heated Seats Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the appropriate scan tool driver or passenger door switch parameters listed below while pressing and releasing the appropriate heated seat switch. The readings should change between Inactive and Active.

* Seat Heat Mode Sw.
* Seat Back Heat Mode Sw.

• If not the specified value, refer to Circuit/System Testing.

2. If all heated seat switch functions operate OK, but, one or more of the heated seat switch indicators is inoperative or is always ON, refer to Heated Seat Switch Indicator Malfunction.
3. If all scan tool parameters test normal and there are no DTCs set, replace the MSM.

Circuit/System Testing

Heated Seat Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 7 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Seat Heat Mode Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the appropriate driver or passenger door module.

4. Verify the scan tool Seat Back Heat Mode Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the appropriate driver or passenger door module.

5. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Seat Heat Mode Sw. parameter is Active.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate driver or passenger door module.

6. Install a 3A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Seat Back Heat Mode Sw. parameter is Active.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate driver or passenger door module.

7. If all circuits test normal, test or replace the heated seat switch.

Heated Seat Switch Indicator Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. Ignition ON, connect a test lamp between the control circuits listed below and ground. Command the appropriate driver or passenger door switch Heated Seat Indicator ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

* Back and cushion heat indicator terminal 1
* Low heat indicator terminal 6
* Medium heat indicator terminal 8
* Back heat indicator terminal 9
* High heat indicator terminal 10

• If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the door module.
• If the test lamp is always OFF, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.

3. If all circuits test normal, test or replace the heated seat switch.

Component Testing

Heated Seat Switch
1. Ignition OFF, disconnect the harness connector at the heated seat switch switch.
2. Test for infinite resistance between the signal terminal 4 and the ground terminal 7 with the back and cushion switch in the open position.

• If not the specified value, replace the heated seat switch switch.

3. Test for infinite resistance between the signal terminal 5 and the ground terminal 7 with the back only switch in the open position.

• If not the specified value, replace the heated seat switch switch.

4. Test for less than 2 ohms between the signal terminal 4 and the ground terminal 7 with the back and cushion switch in the closed position.

• If greater than the specified value, replace the heated seat switch.

5. Test for less than 2 ohms between the signal terminal 5 and the ground terminal 7 with the back only switch in the closed position.

• If greater than the specified value, replace the heated seat switch.

6. Install a 3A fused jumper wire between the ground terminal 7 and ground.
7. Connect a test lamp between the control circuits listed below and B+. The selected switch indicator should illuminate.

* Back and cushion heat indicator terminal 1
* Low heat indicator terminal 6
* Medium heat indicator terminal 8
* Back heat indicator terminal 9
* High heat indicator terminal 10

• If any indicator does not illuminate, replace the heated seat switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Heater Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for MSM and driver or passenger door switch replacement, programming, and setup

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