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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 770 (General Hydraulic Brake System) >> Diagnostic Information & Procedures >> Brake Warning Indicator Always On

Brake Warning Indicator Always On

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Brake Warning Indicator Always On Diagnosis

Step Action Yes No
Schematic Reference: Brake Warning System Schematics in  SYSTEM WIRING DIAGRAMS 
1 Did you review the Hydraulic Brakes System Description and Operation and perform the necessary inspections? Go to Step 2  Go to Symptoms - Hydraulic Brakes 
2 Verify a fault is present. Does the system operate normally? Go to TESTING FOR INTERMITTENT & POOR CONNECTIONS Go to Step 3 
3
  1. 1)  Install a scan tool.
  2. 2)  Select the Instrument Panel Cluster Special Functions menu.
  3. 3)  Command the Brake Lamp Off.
Does the Brake Warning indicator turn OFF?		 Go to Step 4  Go to Step 12 
4
  1. 1)  Select Input 1 from the BCM Data Display menu.
  2. 2)  Ensure the park brake is released.
  3. 3)  Observe the Park Brake status.
Does the scan tool display released?		 Go to Step 5  Go to Step 6 
5 Disconnect the Brake Fluid Level Switch. Does the Brake Warning indicator turn OFF? Go to Step 13  Go to Step 9 
6 Disconnect the park brake switch. Does the Brake Warning indicator turn OFF? Go to Step 10  Go to Step 7 
7 Disconnect the ignition switch. Does the Brake Warning indicator turn OFF? Go to Step 15  Go to Step 8 
8
  1. 1)  Disconnect from the BCM, the harness connector containing the park brake switch output circuit.
  2. 2)  Test the park brake switch output circuit for a short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 16  Go to Step 11 
9 Disconnect from the EBCM, the harness connector containing the brake fluid level sensor signal circuit. Test the brake fluid level sensor signal circuit for a short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition? Go to Step 16  Go to Step 14 
10 Replace the park brake switch. Refer to PARK BRAKE WARNING LAMP SWITCH REPLACEMENT . Did you complete the replacement? Go to Step 16  -
11 Important:  Perform the set up procedure for the BCM. Replace the BCM. Refer to BODY CONTROL MODULE . Did you complete the replacement? Go to Step 16  -
12 Replace the Instrument Panel Cluster. Refer to INSTRUMENT PANEL CLUSTER (IPC) REPLACEMENT . Did you complete the replacement? Go to Step 16  -
13 Replace the brake fluid level switch. Refer to Master Cylinder Reservoir Replacement . Did you complete the replacement? Go to Step 16  -
14 Important:  Use the scan tool in order to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to ELECTRONIC BRAKE CONTROL MODULE (EBCM) REPLACEMENT . Did you complete the replacement? Go to Step 16  -
15 Replace the Ignition switch. Refer to IGNITION SWITCH REPLACEMENT - ON VEHICLE . Did you complete the replacement? Go to Step 16  -
16 Verify the system is repaired. Does the system operate normally? System OK Go to Step 2 
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