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Home >> Mazda >> 2007 >> B2300 Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Troubleshooting (Instrumentation/Driver Information) >> Pinpoint Test 16: Brake Warning Indicator Is Never On >> Possible Causes

Possible Causes

CAUTION:
  • Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
BRAKE WARNING INDICATOR IS NEVER ON - PINPOINT TEST REFERENCE

PINPOINT TEST 16 BRAKE WARNING INDICATOR IS NEVER ON
STEP INSPECTION ACTION
1 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL
  • Key ON.
  • Enter the following diagnostic mode on the scan tool:
    • Instrument Cluster Active Command
  • Select the instrument cluster indicator lamp control active command. Select the brake warning indicator active command on. Observe the brake warning indicator.
  • Does the brake warning indicator illuminate when commanded on? 
 Yes Go to next step.
No Go to step 11.
2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS
  • Retrieve the recorded DTCs from the instrument cluster continuous and on-demand self-tests.
  • Are any DTCs present? 
 Yes For DTC C1226, go to step 8. For all other instrument cluster DTCs, See INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX , .
No If the brake warning indicator does not operate with the parking brake, go to next step. If the brake warning indicator does not operate with low brake fluid level, go to step 6.
3 CHECK THE PARKING BRAKE INPUT
  • Key OFF.
  • Disconnect: Parking brake switch 0918-201.
  • Connect a fused (10A) jumper wire between the parking brake switch 0918-201 pin 1, circuit (GY/L), harness side and the parking brake switch 0918-201 pin 2, circuit (B/L), harness side.
  • Key ON.
  • Does the brake warning indicator illuminate? 
 Yes Install a new parking brake switch. Test the system for normal operation.
No Remove the jumper wire. Go to next step.
4 CHECK CIRCUIT (B/L) FOR AN OPEN
  • Key OFF.
  • Measure the resistance between the parking brake switch 0918-201 pin 2, circuit (B/L), harness side and ground.
  • Is the resistance less than 5 ohms? 
 Yes Go to next step.
No Repair the circuit. Test the system for normal operation.
5 CHECK THE CIRCUIT (GY/L) FOR AN OPEN
  • Disconnect: Instrument cluster 0922-101.
  • Measure the resistance between the instrument cluster 0922-101 pin 20, circuit (GY/L), harness side and the parking brake switch 0918-201 pin 1, circuit (GY/L), harness side.
  • Is the resistance less than 5 ohms? 
 Yes Go to step 11.
No Repair the circuit. Test the system for normal operation.
6 CHECK THE BRAKE FLUID LEVEL SWITCH INPUT
  • Key OFF.
  • Disconnect: Brake fluid level switch 0413-106.
  • Key ON.
  • Does the brake warning indicator illuminate? 
 Yes Go to next step.
No Go to step 8.
7 CHECK CIRCUIT (B/Y) FOR AN OPEN
  • Key OFF.
  • Measure the resistance between the brake fluid level switch 0413-106 pin 1, circuit (B/Y), harness side and ground.
  • Is the resistance less than 5 ohms? 
 Yes INSTALL a new brake fluid level switch. TEST the system for normal operation.
No Repair circuit (B/Y) for an open- Test the system for normal operation.
8 CHECK THE ABS MODULE OPERATION
  • Key OFF.
  • Disconnect: ABS module 0413-102.
  • Connect: Brake fluid level switch 0413-106
  • Key ON.
  • Observe the brake warning indicator.
  • Does the brake warning indicator stay illuminated after prove-out? 
 Yes Go to step 10.
No Go to next step.
9 CHECK CIRCUIT (G/V) FOR A SHORT TO GROUND
  • Disconnect: Instrument cluster 0922-101.
  • Measure the resistance between the instrument cluster 0922-101 pin 16, circuit (G/V), harness side and ground.
  • Is the resistance greater than 10,000 ohms? 
 Yes Go to step 11.
No Repair the circuit. Test the system for normal operation.
10 CHECK FOR CORRECT ABS MODULE OPERATION
  • Disconnect the ABS module connector.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect the ABS module connector and make sure it seats correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes Install a new ABS module. see ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . Test the system for normal operation.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. Clear the DTCs. Repeat the self-test.
11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
  • Disconnect all the instrument cluster connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all the instrument cluster connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes Install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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