Fault-Tracing Information

Central electronic module (CEM) has built-in short-circuit protection to protect its internal electronics. This means that if Central electronic module (CEM) detects a fault on certain outputs, the output is turned off during the existing driving cycle.

The output is activated again after the ignition has been turned off and on again.

If the fault remains, the output will be shut off again, when Central electronic module (CEM) detects the fault.

Use the following information and general checks during fault-tracing.

1. Check, if possible, relevant functions in the vehicle using buttons/controls/test drives to determine the status of the fault.
   NOTE:

   If the vehicle does not show any of the given symptoms in the diagnostic trouble code information (DTC), this may mean that the fault is intermittent or that the control module is not detecting the fault at this moment.

2. Use the diagnostic trouble code's frozen values  , status identifiers  and counter  to determine the operating conditions when the fault was detected, the fault's current status and any degree of intermittence of the fault.
3. Check and fault-trace according to the fault causes  that are specified in the diagnostic trouble code (DTC) information  .
4. Use VIDA (Volvo Scan Tool) Vehicle communication  . Read off the parameters, activate components and functions, carry out quick tests and checking routines for the diagnostic trouble codes to identify the fault.
5. Check relevant signals using, signal specification  and breakout box  .

Remedy as necessary.

Other information 

• see DESCRIPTION OF FROZEN VALUES
• see DESCRIPTION OF STATUS IDENTIFIER
• see DESCRIPTION OF COUNTER
• see DESCRIPTION OF PARAMETERS
• see DESCRIPTION OF ACTIVATION
• see COMPONENT LOCATION, CENTRAL ELECTRONIC MODULE (CEM)
• see CONNECTING THE BREAKOUT BOX
• see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)
• see CONTENTS
• see HEADLAMPS
• see CONTROL MODULE LIGHT CONTROL

Fig 1: Identifying VIDA (Volvo Scan Tool)

Courtesy of VOLVO CARS CORPORATION

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  Refer to INFORMATION