2: When IG "ON" (Engine Stopped) TCL Light Does Not Illuminate

CIRCUIT OPERATION
- Power to the TCL indicator light is supplied from the ignition switch. The ABS-ECU grounds the circuit to turn the light ON.
- The ABS-ECU illuminates the TCL indicator light for 3 seconds while running self-check. This light can be illuminated for 3 seconds upon start-up or key ON, engine stopped.

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

TROUBLESHOOTING HINTS
The most likely causes for this condition:
- Blown fuse
- Damaged wiring harness or connector
- Burnt out TCL indicator light bulb
- Malfunction of the ABS-ECU

DIAGNOSIS
Required Special Tool: MB991223: Harness Set





STEP 1. Check the power supply circuit at ABS-ECU connector A-02.
1. Disconnect connector A-02 and measure at the harness side
2. Turn the ignition switch to "ON" position.
3. The TCL indicator light should illuminate if terminal 13 is Grounded.
If it does not illuminate, go to Step 2.
If it illuminates, go to Step 4.

STEP 2. Check the TCL indicator light bulb.
1. Remove the combination meter.
2. Check the TCL indicator light bulb.
If the TCL indicator light bulb is burned out, replace it. Then go to Step 9.
If the TCL indicator light bulb is not burned out, go to Step 3.





STEP 3. Check the combination meter for the continuity.
1. Remove the combination meter.
2. Remove the TCL indicator light bulb. Then measure the resistance between the bulb terminals.
3. Install the TCL indicator light bulb to the combination meter, and then measure the resistance between connector C-41 terminals 52 and 43. The resistance reading at this time should be much the same as the resistance measured at step (2).
If the two resistance values are extremely different each other, replace the combination meter (printed circuit board).
If the two resistance values are much the same, go to Step 4.





STEP 4. Check the power supply circuit at the combination meter.
1. Disconnect connector C-41, and check at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 52 and ground. It should be approximately 12 V (battery positive voltage).
If not approximately 12 V, go to Step 7.
If approximately 12 V, go to Step 5.











STEP 5. Check connectors C-41, C-94, and A-02. Check connectors C-41, C-94, and A-02. (Refer to Harness Connector Inspection.) Initial Inspection and Diagnostic Overview

If defective, repair the connector. Then go to Step 9.
If not defective, go to Step 6.

STEP 6. Check the continuity between the combination meter and the ABS-ECU. Check the harness wire between the combination meter C-41 and the ABS-ECU connector A-02 for continuity.
If open circuit, repair the wire. Then go to Step 9.








STEP 7. Check connectors C-41, C-104, and C-101. Check connectors C-41, C-104, and C-101 . (Refer to Harness Connector Inspection.) Initial Inspection and Diagnostic Overview

If defective, repair the connector. Then go to Step 9.
If not defective, go to Step 8.

STEP 8. Check the continuity between the ignition switch (IG1) and the combination meter.
Check the harness wire between the ignition switch (IG1) and terminal 52 of combination meter connector C-41 for continuity.
If open circuit, repair the wire. Then go to Step 9.
If less than 2 ohm, go to Step 9.

STEP 9. Check symptoms.
Confirm the TCL indicator light illuminates 60 seconds when the ignition switch is turned to the "ON" position with engine stopped or upon start-up.