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

ABS WARNING LIGHT POWER SUPPLY AND GROUND CIRCUIT














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 case:
- Blown fuse
- Damaged wiring 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.
If there is no continuity, replace the ABS warning lamp. Then go to Step 7.
If there is continuity, go to Step 2.
STEP 2. Check the ABS warning light relay continuity.
1. Remove the ABS warning light relay.
2. Apply the positive terminal of the battery to the No. 1 terminal and the negative terminal to the No. 3 terminal, and then check the continuity between the No. 5 terminal and the No. 2 terminal.
If there is continuity, replace the ABS warning light relay. Then go to Step 7.
If there is no continuity, 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.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 4.
If approximately 12 volts, go to Step 5.





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).
If the ABS warning light is damaged, replace the printed circuit board or ABS warning light bulb. Then go to Step 7.
If the ABS warning light is not damaged, 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 of connector A-10X and the ground.
If there is no continuity, repair the harness wire. Then go to Step 7.
If there is continuity, 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.
If 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 is damaged, repair it.
Then go to Step 7.








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.

STEP 7. Check symptoms
Confirm that the intermediate connectors, the harness wire, the printed circuit board, the ABS warning light bulb and the ABS warning light relay are normal.