2: ABS Warning Light Does Not Illuminate When Key Is Turned On

INSPECTION PROCEDURE 2: When the ignition switch Is turned "ON" (engine stopped), the ABS warning light does not illuminate.

ABS Warning Light Power Supply and Ground Circuit





Part 1 of 2





Part 2 of 2

CIRCUIT OPERATION
The ABS warning light power is supplied from the ignition switch.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be: an open circuit in the ABS warning light power supply circuit, a blown ABS warning light bulb or ABS warning light relay.

TROUBLESHOOTING HINTS
(The most likely causes for this condition:)
- Blown fuse
- Damaged wring harness or connector
- Burnt out ABS warning light bulb
- Malfunction of the ABS warning light relay

DIAGNOSIS
Required Special Tool: MB991223: Harness Set





STEP 1. Check the ABS warning light relay continuity.
1. Remove the ABS warning light relay.
2. Check the continuity between terminal number 1 and number 3 and between terminal number 5 and number 2 at the ABS warning light relay.
Q: Is the ABS warning light relay continuity?
YES: Go to Step 2.
NO: Replace the ABS warning light and then go to Step 7.

STEP 2. Check the ABS warning light relay continuity.
1. Remove the ABS warning light relay.
2. Apply the positive terminal to the number 3 terminal, and then check the continuity between the number 5 terminal and the number 2 terminal.
Q: Is the ABS warning light relay continuity?
YES: Replace the ABS warning light and then go to Step 7.
NO: Go to Step 3.





STEP 3. Check the power supply circuit at the ABS warning light relay connector A-10X.
1. Start the engine.
2. Measure at the relay box in engine compartment side the voltage between the terminal 5 and ground.
Q: Is the voltage approximately 12 Volts?
YES: Go to Step 5.
NO: Go to Step 4.





STEP 4. Check the combination meter (ABS warning light) continuity.
1. Remove the combination meter.
2. Check the continuity between terminal number 29 (combination meter side connector C-29) and number 8 (combination meter side connector C-30).
Q: Is the combination meter (ABS warning light) relay continuity?
YES: Replace the printed circuit board or ABS warning light bulb then go to Step 7.
NO: Go to Step 6.





STEP 5. Check the harness wire between ABS warning light relay connector A-10X and ground.
The continuity should exist between terminal 2 or connector A-10X and ground.
Q: Are any harness wire between ABS warning light relay connector A-10X and ground damage?
YES: Repair the harness wire then go to Step 7.
NO: Go to Step 5.














STEP 6. Check the harness wire between ABS warning light relay connector A-10X and combination meter connector C-30 or check the harness wire between ignition switch (IG1) and combination meter connector C-29.

NOTE: After inspecting intermediate connector C-66, C-73 or C-78 inspect the wire. If intermediate connector C-66,C-73 or C-78 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 7.

Q: Are any harness wire between ABS warning light relay connector A-10X and combination meter connector C-30 or check the harness wire between ignition switch (IG1) and combination meter connector C-29 damage?
YES: Repair the harness wire then go to Step 7.
NO: Go to Step 5.

STEP 7. Check symptoms
Q: Does the ABS warning light illuminate for 3 seconds when the ignition switch is turned to the "ON" position with engine stopped or upon start-up?
YES: This diagnosis is complete.
NO: Return to Step 1.