Diagnostic Aids
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- The following conditions may cause an intermittent malfunction:
- There is an intermittent short to voltage in the LH turn signal monitor circuit.
- The turn signal switch or the hazard switch is shorted internally or is sticking.
- If the BCM detects continuous voltage on the LH turn signal monitor circuit, the BCM interprets this as a short to voltage. The BCM will continue with normal daytime running lights (DRL) operation, and the LR turn signal will remain inoperative.
- If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Testing for Intermittent Conditions and Poor Connections .
DTC B3950
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Observe the left rear turn signal lamp. Is the lamp always ON? |
Go to Step 6 | Go to Step 4 |
| 4 | Inspect the condition of the left rear turn signal bulb. Is the bulb burned out? |
Go to Step 8 | Go to Step 5 |
| 5 | Test for the following in the left rear stop/turn lamp supply voltage circuit:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
Go to Step 10 | Go to Step 7 |
| 6 | Test for a short to voltage in the left rear stop/turn lamp supply voltage circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 10 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 10 | Go to Step 9 |
| 8 | Replace the left rear turn signal bulb. Refer to Tail Lamp Bulb Replacement (Coupe) or Tail Lamp Bulb Replacement (Sedan) . Did you complete the replacement? |
Go to Step 10 | - |
| 9 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 10 | - |
| 10 |
|
Go to Step 2 | System OK |