7B: ABS Warning Light Does Not GO Off

ABS WARNING LIGHT DOES NOT GO OFF.

DIAGNOSIS:
- ABS warning light circuit is open or shorted.

TROUBLE SYMPTOM:
- When starting the engine and while ABS warning light is kept ON.





WIRING DIAGRAM

7B1: CHECK INSTALLATION OF ABSCM & H/U CONNECTOR.
Turn ignition switch to OFF.
CHECK: Is ABSCM&H/U connector inserted into ABSCM until the clamp locks onto it?
YES: Go to step 7B2
NO: Insert ABSCM&H/U connector into ABSCM&H/U until the clamp locks onto it.

7B2: CHECK DIAGNOSIS TERMINAL.





Measure resistance between diagnosis terminals (B81) and chassis ground.
Terminals
Diagnosis terminal (A)-Chassis ground:
Diagnosis terminal (B)-Chassis ground:
CHECK: Is the resistance less than 0.5 ohms?
YES: Go to step 7B3.
NO: Repair diagnosis terminal harness.

7B3 CHECK DIAGNOSIS LINE.
1. Turn ignition switch to OFF.
2. Connect diagnosis terminal (B81) to diagnosis connector (B82) No. 6.
3. Disconnect connector from ABSCM & H/U.





4. Measure resistance between ABSCM & H/U connector and chassis ground.
Connector & terminal
(F49) No. 4-Chassis ground:
CHECK: Is the resistance less than 0.5 ohms
YES: Go to step 7B4.
NO: Repair harness connector between ABSCM&H/U and diagnosis connector.

7B4: CHECK GENERATOR.
1. Start the engine.
2. Idle the engine.





3. Measure voltage between generator and chassis ground.
Terminals
Generator B terminal (+)-Chassis ground (-):
CHECK: Is the voltage between 10 and 15 V?
YES: Go to step 7B5
NO: Repair generator.

7B5: CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
CHECK: Is there poor contact at battery terminal?
YES:Repair battery terminal.
NO: Go to step 7B6.

7B6: CHECK POWER SUPPLY OF ABSCM.
1. Disconnect connector from ABSCM & H/U.
2. Start engine.
3. Idle the engine.





4. Measure voltage between ABSCM & H/U connector and chassis ground.
Connector & terminal
(F49) No. 1 (+)-Chassis ground (-):
CHECK: Is the voltage between 10 and 15 V?
YES: Go to step 7B7.
NO: Repair ABSCM&H/U power supply circuit.

7B7: CHECK WIRING HARNESS.
1. Disconnect connector (F2) from connector (B100).
2. Turn ignition switch to ON.
CHECK: Does the ABS warning light remain off?
YES: Go to step 7B8.
NO: Repair front wiring harness.

7B8: CHECK PROJECTION AT ABSCM & H/U.
1. Turn ignition switch to OFF.





2. Check for broken projection at the ABSCM & H/U terminal.
CHECK: Are the projection broken:
YES: Replace ABSCM&H/U
NO: Go to step 7B9.

7B9: CHECK ABSCM & H/U.





Measure resistance between ABSCM & H/U terminals.
Terminals
No. 21-No. 23:
CHECK: Is the resistance more than 1 M ohms
YES: Go to step 7B10
NO: Replace ABSCM&H/U.

7B10: CHECK WIRING HARNESS.





Measure resistance between connector (F2) and chassis ground.
Connector & terminal
(F2) No 8-Chassis ground:
CHECK: Is the resistance less than 0.5 ohms?
YES: Go to step 7B11.
NO: Repair harness.

7B11 CHECK WIRING HARNESS.
1. Connect connector to ABSCM & H/U.





2. Measure resistance between connector (F2) and chassis ground.
Connector & terminal
(F2) No. 8-Chassis around:
CHECK: Is the resistance more than 1 M ohms
YES: Go to step 7B12.
NO: Repair harness

7B12: CHECK POOR CONTACT IN ABSCM & H/U CONNECTOR.
CHECK: Is there poor contact in ABSCM&H/U connector?
YES: Repair connector.
NO: Replace ABSCM&H/U.