ABS (DIAGNOSTICS) > ABS Warning Light / Brake Warning Light Illumination Pattern

DETECTING CONDITION:

• Brake warning light circuit is shorted.

• Defective sensor/connector

TROUBLE SYMPTOM:

After starting the engine, the brake warning light remains lit though the parking lever is released.

NOTE:

If the ABS warning light is lit, perform the diagnosis of “ABS WARNING LIGHT DOES NOT GO OFF”, then the diagnosis of “BRAKE WARNING LIGHT DOES NOT GO OFF” after repairing it.

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK INSTALLATION OF ABSCM&H/U CONNECTOR. 1) Turn the ignition switch to OFF. 2) Check that the ABSCM&H/U connector is inserted to ABSCM&H/U until the clamp locks onto it.	Is the connector firmly inserted?		Insert the ABSCM&H/U connector until the clamp locks completely.
2.READ DTC. Read the DTC.	Is DTC displayed?	Perform the diagnosis according to DTC.
3.CHECK BRAKE FLUID AMOUNT. Check the amount of brake fluid in the reservoir tank of the master cylinder.	Is the amount of brake fluid between the lines of “MAX” and “MIN”?		Replenish brake fluid to the specified value.
4.CHECK BRAKE FLUID LEVEL SWITCH. 1) Disconnect the level switch connector (B16) from master cylinder. 2) Measure the resistance of master cylinder terminals. Terminals No. 1 — No. 2:	Is the resistance more than 1 MΩ?		Replace the master cylinder.
5.CHECK PARKING BRAKE SWITCH. 1) Disconnect the connector (R4) from parking brake switch. 2) Release the parking brake. 3) Measure the resistance between parking brake switch terminal and chassis ground.	Is the resistance more than 1 MΩ?		Replace the parking brake switch.
6.CHECK GROUND SHORT OF HARNESS. 1) Disconnect the connector (i11) from combination meter. 2) Measure the resistance between combination meter connector and chassis ground. Connector & terminal (i11) No. 3 — Chassis ground:	Is the resistance more than 1 MΩ?		Repair the harness connector between combination meter and parking brake switch.
7.CHECK HARNESS. 1) Disconnect the connector (F49) from the ABSCM&H/U. 2) Disconnect the connector (i11) from combination meter. 3) Measure the resistance between the ABSCM&H/U connector and combination meter connector. Connector & terminal LHD model (B301) No. 8 — (i11) No. 3: RHD model (F49) No. 8 — (i11) No. 3:	Is the resistance less than 0.5 Ω?		Repair the harness between the ABSCM&H/U and the combination meter.
8.CHECK POOR CONTACT IN CONNECTOR. Check for poor contact in all connectors.	Is there poor contact?	Repair the connector.
9.CHECK ABSCM. 1) Connect the connector to ABSCM&H/U. 2) Turn the ignition switch to ON. 3) Measure the resistance between combination meter connector and chassis ground. Connector & terminal (i11) No. 3 — Chassis ground:	Is the resistance less than 0.5 Ω?	Check the combination meter.	Replace the ABSCM only.