ABS Warning Light Constantly On

Fault symptoms
ABS warning light constantly on.
No DTCs generated.

Conditions
- Circuit between pin 21 on the ABS control module and pin 10 on the MIU (K20) shorting to ground.
- Short-circuit contact strip in connector faulty.

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

Diagnostic procedure
1, Checking The Short-circUlt Contact Strip





^ Break the contact strip.
The ABS warning light should now be extinguished.

Is the function correct?

NO
Go To Step 3

YES
Go To Step 2

2. Checking The Operation Of The Short-Circult Contact-Strip





^ Check that the breakpin in the short-circuiting contact strip is in proper working order.

Is the function correct?

NO
Go To Step 4

YES
Go To Step 7

3. Checking the lead





^ Check for shorting to B- (ground) in the lead between pin 21 of the control module and pin 10 of the MIU (K20).

Is the function correct?

NO
Go To Step 5

YES
Go To Step 6

4. Checking The Operation Of The Short-Circult Contact-Strip

^ Rectify the fault.

When repair is complete:
Go To Step 7

5. Rectifying the lead





Repair or replace the lead

When repair is complete:
Go to step 7

6. Checking the lead

Continue with fault diagnosis of the MIU
Refer to Instrument Panel, Gauges and Warning Indicators.

7. Final Check





^ Clear the diagnostic trouble codes in all systems.





^ Carry out a drive cycle
Drive the car at varying engine loads and engine rpm for five minutes.

^ Evaluate the drive cycle:





^ Check that the diagnostic trouble code has not recurred

Is the function correct?

YES
Go To Step 8

NO
Go To Step 9

8. Final Check
The steps taken to correct the fault were correct.
^ Diagnosis is complete.

9. Final Check
See Before changing a control module, refer to General Fault Diagnosis.
^ Diagnosis for this fault code is complete.