2: ABS Warning Light Does Not Illuminate

INSPECTION PROCEDURE 2: When the Ignition Switch is Turned to the "ON" (Engine Stopped), the ABS Warning Light does not Illuminate.





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 normal?
YES: Go to Step 2.
NO: Replace the ABS warning light and then go to Step 6.





STEP 2. Check the power supply circuit at the ABS warning light relay connector A-13X.
1. Start the engine.
2. Measure at the relay box in engine compartment side the voltage between the terminal 5 and ground. It should be approximately 12 volts.
Q: Is the voltage approximately 12 volts?
YES: Go to Step 4.
NO: Go to Step 3.





STEP 3. 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 there continuity?
YES: Go to Step 5.
NO: Replace the printed circuit board or ABS warning light bulb then go to Step 6.





STEP 4. Check the harness wire between ABS warning light relay connector A-13X and ground.
The continuity should exist between terminal 2 of the connector A-13X and ground.
Q: Is the harness wire between ABS warning light relay connector A-13X and ground damaged?
YES: Repair the harness wire then go to Step 6.
NO: Go to Step 6.














STEP 5. Check the harness wire between ABS warning light relay connector A-13X 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 connectors C-17, C-84 and C-87 inspect the wires. If intermediate connector C-17, C-84 or C-87 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 6.

Q: Are any harness wire between ABS warning light relay connector A-13X and combination meter connector C-30 or between ignition switch (IG1) and combination meter connector C-29 damaged?
YES: Repair the harness wire then go to Step 6.
NO: Go to Step 6.

STEP 6. 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.