NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION

6	BRAKE system warning light stays on 4 s or more when the ignition switch is turned to the ON position. (Parking brake is released.)
[TROUBLESHOOTING HINTS] • Malfunction of instrument cluster or ABS HU/CM • Short to ground in circuit in parking brake switch and/or brake fluid level sensor


STEP	INSPECTION		ACTION
1	INSPECT BRAKE FLUID LEVEL • Is brake fluid level normal?	Yes	Go to the next step.
1		No	Add brake fluid.
^*2	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS • Monitor the one or more items of ABS HU/CM using the M-MDS datalogger function. • Is error message displayed regarding communication between ABS HU/CM and M-MDS?	Yes	If a communication error message is displayed even after inspecting according to procedures displayed on M-MDS. Go to next Step 6.
^*2		No	Go to the next step.
3	INSPECT FOR DTCs IN ABS HU/CM • Have DTCs been stored in memory?	Yes	Perform the applicable DTC inspection. (See DTC Table.)
3		No	Go to the next step.
4	INSPECT WARNING LIGHT OPERATION • Turn on the all warning light on instrument cluster using the instrument cluster input/output check code26. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE.) • Does the warning light illuminate?	Yes	Go to the next step.
4		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
5	VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR BRAKE FLUID LEVEL SENSOR, OR IN SOME OTHER PART • Disconnect in the following order: 1. Parking brake switch connector 2. Brake fluid level sensor connector • Does the BRAKE system warning light go out with ignition switch turned to the ON position?	Yes	Replace the parking brake switch and/or brake fluid level sensor (Short with some internal part). (See MASTER CYLINDER REMOVAL/INSTALLATION.) (See PARKING BRAKE LEVER REMOVAL/INSTALLATION.)
5		No	Perform the following inspections. Repair if necessary. • Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and parking brake switch. • Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and brake fluid level sensor. If inspection results are okay, replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION.)
^*6	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY • Disconnect the ABS HU/CM connector. • Is there continuity between connector terminal Z, Y and DLC-2?	Yes	Go to the next step.
^*6		No	Repair the wiring harness between the ABS HU/CM and DLC-2.
^*7	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+ • Is the voltage approx. 12 V at connector terminal Z, Y?	Yes	Repair the wiring harness between the ABS HU/CM and DLC-2.
^*7		No	Go to the next step.
^*8	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND • Is there continuity between connector terminal Z, Y and ground?	Yes	Repair the wiring harness between the ABS HU/CM and DLC-2.
^*8		No	Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM). (See ABS HU/CM REMOVAL/INSTALLATION.)

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