Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
If the DTC is only found in history, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
DTC B2435 or B2440 Diagnostic Test
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views |
||||
| 1 | Did you perform the Power Seat Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - Power Seat Systems |
| 2 |
|
0.07-4.94 | Go to Step 3 | Go to Step 4 |
| 3 | Is the seat heat sensor value reducing as the seat back temperature rises? | - | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 6 |
| 4 | Disconnect the seat back element 4-way connector. Is the seat heat sensor value greater than the specified value? |
4.5 V | Go to Step 5 | Go to Step 7 |
| 5 | Connect a fused jumper wire between the heat sensor signal and low reference circuit terminals in the seat back element 4-way harness connector. Is the seat heat sensor value greater than the specified value? |
0.5 | Go to Step 8 | Go to Step 11 |
| 6 |
|
- | Go to Step 11 | Go to Step 10 |
| 7 | Test the heated seat sensor signal circuit for a short to ground. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 12 |
| 8 | Test the heated seat sensor signal circuit for one of the following conditions:
Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 9 |
| 9 | Test the heated seat sensor low reference circuit for an open or high resistance. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 12 |
| 10 | Test the seat back element supply and control circuits for an open or high resistance. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 12 |
| 11 | Inspect for poor connections at the seat back element 4-way connector. Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 13 |
| 12 | Inspect for poor connections at the seat control module. Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 15 | Go to Step 14 |
| 13 | Replace the seat back heater element. Refer to Seat Back Cover and Pad Replacement - Front . Is the repair complete? |
- | Go to Step 15 | - |
| 14 | Replace the seat control module. Refer to Memory Seat Control Module Replacement . Is the repair complete? |
- | Go to Step 15 | - |
| 15 |
|
- | Go to Step 2 | System OK |