ABS Warning Lamp Fails to Come On

ABS warning lamp fails to come on.

Fault symptoms
The ABS warning lamp does not come on. (The ABS warning-lamp test is activated when the ignition is switched on. During this test, the lamp should come on for about 3 seconds.)

Diagnostic help
The ABS warning lamp can be activated using the diagnostic tool.
- Select "Activate".
- Select "ABS warning lamp".

Conditions
Fault in circuit between pin 21 of the ABS control module and the ABS warning lamp on the MIU.

Diagnostic procedure
1. Check ABS Lamp Functionality





Unplug the connector.
^ Control module, ABS (547)





^ Turn the ignition switch to the ON position.





^ Connect a jumper lead between pins 19 and 21 of the female connector.





^ The ABS lamp should light up.

Is the function correct?

NO
Go to step 6

YES
Go to step 2

2. Check ABS Lamp Functionality





Check the control module connector for moisture, corrosion and displaced pins.

IF OK
Go to step 3

3. Checking The Lead





Check the lead between pin 21 of the ABS control module and pin 10 of the MIU (K20).

Is the wiring OK?

NO
Go to step

YES
Go to step

4. Checking The Lead

Continue with fault diagnosis on the MIU.

5. Rectifying The Lead





^ Repair or replace the lead

When repair is complete.
Go to step 6

6. Final Check





^ Clear the diagnostic trouble codes in all systems.
^ Carry out a functionality test.

Is the function correct?

NO
Go to step 8

YES
Go to step 7

7. Final Check

The steps taken to rectify the fault were correct.
Diagnosis is complete


8. Final Check

Diagnosis for this fault symptom is complete.
Refer to "Before Changing A Control Module" at General.