Test Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2: If an active DTC is set, the BCM will turn OFF the heated seat relay, not allowing for an accurate test of the relay. By cycling the ignition switch, the BCM turns OFF the active DTC allowing for an accurate test.
- 3: This test determines the functionality of the heated seat relay.
- 22: This test verifies the repair.
DTC B1920 or B2165: Seat Heater Timer Circuit
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
- | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 13 | Go to Step 18 |
| 4 |
|
5 Ω | Go to Step 7 | Go to Step 5 |
| 5 |
|
5 Ω | Go to Step 6 | Go to Step 14 |
| 6 |
|
5 Ω | Go to Step 10 | Go to Step 15 |
| 7 |
IMPORTANT:
If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermistor resistance varies with temperature.
|
535-168,000 Ω | Go to Step 12 | Go to Step 8 |
| 8 | Test the heated seat temperature sensor signal circuit and the temperature sensor low reference circuit, between the BCM and the temperature sensor, for a short to ground or an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 9 |
| 9 | Test the heated seat temperature sensor signal circuit, between the BCM and the temperature sensor for a short to battery positive voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 14 |
| 10 | Test the heated seat element supply voltage circuit between the heated seat relay and the seat cushion heating element for an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 11 |
| 11 | Test the heated seat element supply voltage circuit between the seat cushion heating element and the seat back heating element for an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 17 |
| 12 | Test the heated seat element supply voltage circuit between the seat cushion heating element and the seat back heating element for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 16 |
| 13 | Inspect for poor connections at the harness connector of the heated seat relay. 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 22 | Go to Step 19 |
| 14 | Inspect for poor connections at the harness connector of the heated seat cushion heating element/temperature sensor. 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 22 | Go to Step 20 |
| 15 | Inspect for poor connections at the harness connector of the heated seat back heating element. 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 22 | Go to Step 20 |
| 16 | Inspect for poor connections at the harness connector of the BCM. 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 22 | Go to Step 21 |
| 17 | Repair the open in the ground circuit of the seat heating elements. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 22 | - |
| 18 | Repair the short to ground or open in the battery positive voltage circuit of the heated seat relay. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 22 | - |
| 19 | Replace the heated seat relay. Refer to Relay Replacement (Within an Electrical Center)
or Relay Replacement (Attached to Wire Harness)
in Wiring Systems. Did you complete the replacement? |
- | Go to Step 22 | - |
| 20 | Replace the heated seat cushion heating element/temperature sensor or seat back heating element. Refer to Seat Back Heater Element Replacement - Front and Seat Cushion Heater Element Replacement - Front . Did you complete the replacement? |
- | Go to Step 22 | - |
| 21 | Replace the BCM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? |
- | Go to Step 22 | - |
| 22 |
|
- | Go to Step 2 | System OK |