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1
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INSPECT BRAKE FLUID LEVEL
Is brake fluid level okay?
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Yes
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Go to next step.
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No
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Add brake fluid.
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*2
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC (DATA LINK CONNECTOR) FOR CONTINUITY AND SHORTS
Inspect the following items using WDS or equivalent PID/DATA monitor function.
• BRAKE_LAMP(BRAKE system warning light)
Is error message displayed regarding communication between ABS/TCS HU/CM and WDS or equivalent?
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Yes
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If a communication error message is displayed even after inspecting according to procedures displayed on WDS or equivalent.
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No
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Go to next step.
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3
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INSPECT PID/DATA IN ABS/TCS HU/CM
Inspect (BRAKE system warning light) using WDS or equivalent PID/DATA monitor function.
Is BRAKE_LAMP ON after more than 4 seconds with ignition switch on?
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Yes
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Replace ABS/TCS HU/CM (open circuit or short to ground in ABS/TCS HU/CM).
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No
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Go to next step.
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*4
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VERIFY THAT ABS/TCS HU/CM CONNECTOR TERMINAL X IS CONNECTED
Does malfunction symptom happen again when ABS/TCS HU/CM connector terminal X is shaken while the ignition switch is on?
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Yes
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Connect ABS/TCS HU/CM connector terminal X securely, then go to next step.
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No
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Go to step 6.
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5
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS/TCS HU/CM CONNECTOR TERMINAL X IS CONNECTED
Does BRAKE system warning light go out after more than 4 seconds with ignition switch on?
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Yes
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Temporary poor connection at terminal.
Inspect ABS/TCS HU/CM connector and terminal.
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No
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Go to next step.
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*6
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CHECK FOR OPEN CIRCUITS IN ABS/TCS HU/CM
Disconnect ABS/TCS HU/CM connector.
Connect the SST (49 G066 001) (vehicle harness side only).
Use the SST connector to ground BRAKE system warning light terminal X to body ground.
Does BRAKE system warning light go out with ignition switch on?
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Yes
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Replace ABS/TCS HU/CM (open circuit in ABS/TCS HU/CM).
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No
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Go to next step.
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7
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VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR BRAKE FLUID LEVEL SENSOR, OR IN SOME OTHER PART
Disconnect the following in order:
1. Parking brake switch connector
2. Brake fluid level sensor connector
Does BRAKE system warning light go out with ignition switch on?
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Yes
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Replace parking brake switch and/or brake fluid level sensor (shorted on some internal part).
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No
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Perform the following inspections. Repair if necessary.
• Open in wiring harness between ABS/TCS HU/CM (terminal X) and instrument cluster (BRAKE system warning light)
• Short to ground in wiring harness between instrument cluster (BRAKE system warning light) and parking brake switch.
• Short to ground in wiring harness between instrument cluster (BRAKE system warning light) and brake fluid level sensor.
If above inspections are okay, replace instrument cluster (open or ground to short in instrument cluster).
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*8
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC (DATA LINK CONNECTOR-2) FOR CONTINUITY
Disconnect ABS/TCS HU/CM connector.
Connect the SST (49 G066 001) (vehicle harness side only).
Is there continuity between SST connector terminal T and data link connector?
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Yes
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Go to next step.
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No
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Repair wiring harness between ABS/TCS HU/CM and data link connector.
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*9
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC (DATA LINK CONNECTOR-2) FOR SHORT TO B+
Is voltage approximately 12 V at SST connector terminal T?
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Yes
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Repair wiring harness between ABS/TCS HU/CM and data link connector.
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No
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Go to next step.
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*10
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INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC (DATA LINK CONNECTOR-2) FOR SHORT TO GROUND
Is there continuity between SST connector terminal T and ground?
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Yes
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Repair wiring harness between ABS/TCS HU/CM and data link connector.
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No
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Replace ABS/TCS HU/CM (communication circuit malfunction in ABS/TCS HU/CM).
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