Check the Signal to the Control Module [W]

W. Check the signal to the control module

WA. Fault-tracing information






Condition

- DTCs not posted.
- Normal battery voltage.
- The charging system works.
- Fault is permanent.

Possible source

- Signal cable break.
- Signal cable short circuited to power.

Fault-tracing begins with WB Check the signal to the control module.

WB. Check the signal to the control module

[WB1]

Connecting the test box

Connect the test box as per JJJA. Connect the test box. Pinout Values and Diagnostic Parameters

Then proceed to [WB2]

[WB2]

Check the signal cable short circuiting to power






- Ignition off.
- Uncover the instrument panel.
- Disconnect instrument panel connection B.
- Control module disconnected.
- Ignition on.

Connect a voltmeter between #16 and #8 on the test box.

The voltmeter should indicate approx. 0V.

If reading is OK: WB4
If reading Is incorrect: WB3

[WB3]

Check for short circuiting









Check the cable between instrument panel contact connection B6 and control module #16 for short circuiting to current as per [IIIB4]. Check Communication to Control Module [III]

Then continue with: WB6

[WB4]

Check the signal cable resistance






- Ignition off.
- Control module disconnected.

Connect an ohmmeter between instrument panel contact connection B6 and #16 on the test box.

The ohmmeter should indicate approx. 0 ohms

If reading Is OK: Fault not found
If reading is incorrect: WB5

[WB5]

Check for cable breaks









Check the cable between combination instrument contact connection B6 and control module #16 for breaks as per [IIIB2]. Check Communication to Control Module [III]

Then continue with: WB6

[WB6]

Verification

Hint: After repair, it is necessary to check that the fault has been rectified.






- Ignition off.
- Reconnect the connections, components etc.
- Ignition on

When the ignition is switched on, the ABS warning light is activated by the control module. Check that the warning light goes out after approx. 2 seconds.

Note! The warning light will not go out if a fault is registered in the control module.

Does the warning light go out shortly after being activated?

Yes: Fault corrected
No: WB7

[WB7]

Fault-tracing information

The fault should now have been diagnosed and corrected. Since this is not the case the fault-tracing has failed.

Do you want to exit fault-tracing?

Yes: Fault not corrected
No: WB2