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NO.8 BRAKE SYSTEM WARNING LIGHT STAYS ON MORE THAN 4 s WITH IGNITION SWITCH ON

id040300901800

8 | BRAKE system warning light stays on more than 4 s with ignition switch on. (Parking brake is released.)
[TROUBLESHOOTING HINTS] • Malfunction of instrument cluster or ABS (ABS/TCS) HU/CM • Short to ground in circuit in parking brake switch and/or brake fluid level sensor

Diagnostic procedure

1 | INSPECT BRAKE FLUID LEVEL Is brake fluid level normal? | Yes | Go to next step.
No | Add brake fluid.
*2 | 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? | Yes | If a communication error message is displayed even after inspecting according to procedures displayed on WDS or equivalent. Go to next step.
No | Go to next step.
3 | INSPECT FOR DTCS IN ABS (ABS/TCS) HU/CM Have DTCs been recorded in memory? | Yes | Perform inspection using appropriate DTC.
No | Go to next step.
4 | 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? | Yes | Connect ABS (ABS/TCS) HU/CM connector terminal O, R securely, then go to next step.
No | Go to step 6.
5 | 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? | Yes | Replace parking brake switch and/or brake fluid level sensor (shorted on some internal part).
No | 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.
*6 | 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? | Yes | Go to next step.
No | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
*7 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ Is voltage approx. 12 V at connector terminal O, R? | Yes | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
No | Go to next step.
*8 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal O, R and ground? | Yes | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
No | Replace ABS (ABS/TCS) HU/CM (communication circuit malfunction in ABS (ABS/TCS) HU/CM).

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.