Brake Warning Indicator Always On. Buick LaCrosse 2007

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2007 🢒 LaCrosse 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Brake Warning Indicator Always On

Test Description

The number below refers to the step number on the diagnostic table.

If the fuse in the jumper opens when you perform this test, the signal circuit of the brake fluid level switch is shorted to voltage.

Step	Action	Yes	No
Schematic Reference: Hydraulic Brake Schematics
1	Did you review the hydraulic brakes operation and perform the necessary inspection?	Go to Step 2	Go to Symptoms - Hydraulic Brakes
2	Inspect the brake fluid level. Is the brake fluid level OK?	Go to Step 3	Go to Brake Fluid Loss
3	Turn ON the ignition, with the engine OFF. Disengage the park brake. With a scan tool, observe the Park Brake Switch parameter in the BCM Inputs data list. Does the scan tool indicate that the Park Brake Switch parameter is Inactive?	Go to Step 4	Go to Step 5
4	With a scan tool, observe the Brake Warning Lamp parameter in the IPC Inputs data list. Does the scan tool indicate that the Brake Warning Lamp parameter is ON?	Go to Step 12	Go to Step 6
5	Disconnect the park brake warning lamp switch. With a scan tool, observe the Park Brake Switch parameter. Does the scan tool indicate that the Park Brake Switch parameter is Inactive?	Go to Step 9	Go to Step 7
6	Disconnect the brake fluid level switch. With a scan tool, observe the Brake Warning Lamp parameter. Does the scan tool indicate that the Brake Warning Lamp parameter is ON?	Go to Step 10	Go to Step 8
7	Turn OFF the ignition. Test the signal circuit of the park brake warning lamp switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 17	Go to Step 11
8	Turn OFF the ignition. Test the signal circuit of the brake fluid level switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 17	Go to Step 11
9	Inspect for poor connections at the harness connector of the park brake warning lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 17	Go to Step 13
10	Inspect for poor connections at the harness connector of the brake fluid level switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 17	Go to Step 14
11	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 17	Go to Step 15
12	Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 17	Go to Step 16
13	Replace the park brake warning lamp switch. Refer to Parking Brake Indicator Switch Replacement . Did you complete the repair?	Go to Step 17	--
14	Replace the brake fluid level switch. Refer to Brake Fluid Level Indicator Switch Replacement . Did you complete the repair?	Go to Step 17	--
15	Replace the BCM. Refer to Body Control Module Replacement for replacement, setup, and programming. Did you complete the repair?	Go to Step 17	--
16	Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the repair?	Go to Step 17	--
17	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2