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.

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 in Wiring Systems for further diagnosis.

Traction Off Indicator Always On

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 in Vehicle DTC Information
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. Does the scan tool display Off?	Go to Step 3	Go to Step 4
3	Activate the traction control switch. With the scan tool, observe the Traction Switch parameter. Does the Traction Switch parameter change state?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 4
4	Turn OFF the ignition. Disconnect the traction control switch connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Traction Switch parameter. Does the scan tool display Off?	Go to Step 7	Go to Step 5
5	Test the signal circuit of the traction control switch for a short to ground. Refer to Testing for Intermittent Conditions and Poor Connections and Testing for Short to Ground in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 6
6	Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. 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 in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 9
8	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 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