Diagnostic Aids
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- 8: This relay may be a permanently integrated in the BEC on some vehicles, in this case you must replace the BEC in order to complete the repair. Refer to Engine Controls Schematics
DTC P2535
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics
in Engine Controls - 3.8L (L26 and L32) Connector End View Reference: Powertrain Control Module (PCM) Connector End Views and Engine Controls Connector End Views in Engine Controls - 3.8L (L26 and L32) |
||||
| 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 | Connect a test lamp between the ignition 1 voltage circuit on the body control module (BCM) side of the relay and a good ground. Does the test lamp illuminate? |
- | Go to Step 5 | Go to Step 8 |
| 4 | Test the ignition 1 voltage circuit between the PCM and the ignition 1 relay 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 11 | Go to Step 6 |
| 5 | Test the ignition 1 voltage circuit between the BCM and the ignition 1 relay 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 11 | Go to Step 7 |
| 6 | Test for an intermittent and for a poor connection at the PCM. 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 11 | Go to Step 9 |
| 7 | Test for an intermittent and for a poor connection at 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 11 | Go to Step 10 |
| 8 | Replace the ignition 1 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 11 | - |
| 9 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 11 | - |
| 10 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 11 | - |
| 11 |
|
- | Go to Step 2 | Go to Step 12 |
| 12 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |