Diagnostic Aids

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness
The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation
If an intermittent malfunction exists, refer to Inducing Intermittent Fault Conditions for further diagnosis.

Traction Off Indicator Inoperative

Step	Action	Yes	No
Schematic Reference: ABS Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Traction Switch parameter in the body control module (BCM) data list. Activate the traction control switch. Does the Traction Switch parameter change state?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Turn OFF the ignition. Disconnect the traction control switch connector. Connect a fused jumper from the signal circuit of the traction control switch harness connector to a good ground. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Traction Switch parameter. Does the scan tool display On?	Go to Step 5	Go to Step 4
4	Test the signal circuit of the traction control switch for an open or high resistance. 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 6
5	Test the ground circuit of the traction control switch for an open or high resistance. Refer to Testing for Intermittent Conditions and Poor Connections and Testing for Continuity . Did you find and correct the condition?	Go to Step 10	Go to Step 7
6	Inspect for poor connections at the harness connector of the 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 8
7	Inspect for poor connections at the harness connector of the traction control switch. 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 BCM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement?	Go to Step 10	-
9	Replace the traction control switch. Refer to Traction Control Switch Replacement . Did you complete the replacement?	Go to Step 10	-
10	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2