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1
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INSPECT BRAKE FLUID LEVEL
Is brake fluid level normal?
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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 (ABS/TCS) HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS
Inspect the following items using WDS or equivalent PID/DATA monitor function.
• BRAKE_LMP (BRAKE system warning light)
Is error message displayed regarding communication between ABS (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.
Go to next step.
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No
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Go to next step.
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3
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INSPECT FOR DTCS IN ABS (ABS/TCS) HU/CM
Have DTCs been recorded in memory?
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Yes
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Perform inspection using appropriate DTC.
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No
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Go to next step.
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4
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INSPECT PID/DATA IN ABS (ABS/TCS) HU/CM
Inspect (BRAKE system warning light) using WDS or equivalent PID/DATA monitor function.
Is BRAKE_LMP on after more than 4 s with ignition switch on?
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Yes
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Connect ABS (ABS/TCS) HU/CM connector terminal O, R 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 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 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.
Inspect instrument cluster.
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*6
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY
Disconnect ABS HU/CM connector.
Is there continuity between connector terminal O, R and DLC-2?
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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 (ABS/TCS) HU/CM and DLC-2.
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*7
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+
Is voltage approx. 12 V at connector terminal O, R?
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Yes
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Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
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No
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Go to next step.
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*8
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND
Is there continuity between connector terminal O, R and ground?
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Yes
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Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
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No
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Replace ABS (ABS/TCS) HU/CM (communication circuit malfunction in ABS (ABS/TCS) HU/CM).
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