Faulty Signal. Intermittent Fault

Faulty signal. Intermittent fault

Checking components








- Check that the micro-switches appear normal
- Ignition on
- Connect the Volvo Scan Tool (ST)
- Read off the status of the micro-switch for the rear latch, right side
- Operate the micro-switch manually.
The status should change from activation (micro-switch on) to non activation (micro-switch off).
Repeat the same check for the micro-switch for the rear latch, left side.

Other information:
- To access the micro-switch for the rear latch, see Replacing and adjusting micro-switches Replacing and Adjusting Micro-Switches
- Manual operation of the micro switches is possible by setting the rear latches to the "catch position". Gain access through the holes in the cover
- There is a short-circuit to ground if the status is low when the switch inactive
- If the status is high with the micro switch activated there is an open-circuit or a short-circuit to supply voltage.

Hint: The micro-switch can be activated by hand or using a pointed tool. Be careful.









Does the status for both micro-switches change?

Yes - Fault-tracing information

No - Checking the connector

-------------------------------------------------

Checking the connector
Check control module connector C. Check for an intermittent short-circuit to ground. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.

Other information:
- To access or replace the control module see Replacing the control module Service and Repair.









Was a fault detected?

Yes - Fault-tracing information

No - Checking the wiring

-------------------------------------------------

Checking the wiring

Hint: The fault-tracing covers the micro-switch that transmitted a faulty signal.








- Ignition off
- Disconnect the relevant micro-switch.
Check the micro-switch connector. Check for an intermittent short-circuit to ground. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Connect an ohmmeter between micro switch connector terminal #1 and ground and terminal #2 and ground. Test for an intermittent short-circuit to ground. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
The switch should be in unaffected position.
Try a new micro-switch if a short-circuit is found.
If no fault is found, there is probably a fault in the cable between the control module and the micro-switch connector.
Remedy as necessary.

Other information:
- To access the micro-switch for the rear latch, see Replacing and adjusting micro-switches Replacing and Adjusting Micro-Switches.

Hint: The micro-switch can be activated by hand or using a pointed tool. Be careful.









Was a fault detected?

Yes - Fault-tracing information

No - No Fault Found

-------------------------------------------------

Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

------------------------

FAULT-TRACING FAILED - DONE

Attempt New Test - Checking components

-------------------------------------------------