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Home >> Volvo >> 2004 >> XC90 AWD L5-2.5L Turbo VIN 59 B5254T2 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> CEM Codes (Central Electronic Module) >> CEM-1A58 >> Signal Missing

Signal Missing






Signal missing

Checking the power supply





Checking power supply and ground

Checking the power supply and ground for the control module
Check the keypad and carphone module (PHM) connector A. Check for contact resistance and oxidation.
Check fuse 11C/29 for the keypad and carphone module (PHM) in the passenger compartment fusebox.

Note! If the fuse is blown, check the circuit after the fuse. Check for a short-circuit to ground before replacing the fuse. Then replace the fuse. For further information about the circuit after the fuse, refer to the appropriate wiring diagram.

Check the cable for the power supply between fuse 11C/29 in the passenger compartment fusebox and the keypad and carphone module (PHM) terminal #A6. Check for an open-circuit.
Check the ground lead between keypad and carphone module (PHM) terminal #A18 and ground terminal 31/84. Check for an open-circuit. Check ground terminal 31/84. Check for contact resistance and oxidation.
Remedy as necessary.

Other information:
- To access or replace the keypad and carphone control module, see Phone module (PHM), replacing Phone Module (PHM), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- For information about signals and connectors, see Signal specification Signal Specification, Phone Module (PHM)
- For further information about the fuses and relays, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring and Terminals








Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

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FAULT FOUND - Verification

No Fault Found - Checking connectors

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Checking connectors
Check the carphone module (PHM) connector. Check for contact resistance and oxidation. Remedy if necessary. Check for any damage.

Hint: If the fault cause is found, reinstall the components, connectors etc. If the fault cause is not found, do not reinstall the carphone module (PHM).

Other information:
- To access the connector in the carphone module (PHM), see
- Checking wiring and terminals Checking Wiring and Terminals.





Was a fault detected?

Yes - Verification

No - Checking the bus cable

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Checking the bus cable




- Disconnect the carphone module (PHM) from the bus cable, pull the connector out from the control module.
Measure the resistance between terminals #A5 and #A15.

Note! Take care that you measure directly on the connector so that it is not damaged.

Note! To obtain the correct value the battery must be disconnected during resistance measurement.

Other information:
- The resistance must be approximately 60 ohms. If another reading is given, there may be an open-circuit in the bus cable
- To connect the breakout box to the carphone module (PHM), see Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- To disconnect the battery, see Battery, disconnecting Battery Disconnecting.





Does the measuring instrument display a resistance of approximately 60 ohms?

Yes - Replacing the carphone module (PHM)

No - Checking for an open-circuit

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Checking for an open-circuit





Open-circuit in the CAN bus. Low speed network. Permanent fault

Checking the low speed network
The fault source on the bus cable may be a long way from where the check is carried out. Therefore start the check at one end of the cable and work through the bus system methodically until the fault is found. Disconnecting the connector from the control module splits the bus cable into two parts. If the resistance does not correspond to the given value (60 or 120 Ohm) when examining one of the components, the fault is localized in that component. Use the wiring diagram.

Information
- The resistance must be approximately 60 ohms when taking readings on a connected CAN
- The resistance must be approximately 120 ohms when taking readings on a CAN that is not connected.
Check the bus cable. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remember that the CAN bus is only a communication network. There are no fuses, contact breakers or sensors.

Hint: If the fault is detected before all the following cables have been examined, the following cables need not be checked.

Hint: If possible measure from the rear of the affected connectors so that they are not damaged.

The following cables and connectors must be examined to localize a open-circuit.

For the S80, V70, V70XC and S60. The cable between:
- driver information module (DIM) #3 and climate control module (CCM) #12A
- driver information module (DIM) #2 and climate control module (CCM) #14A
- Road Traffic Information (RTI) #22A (#4D model year 2002 and later) and rear electronic module (REM) #17A
- Road Traffic Information (RTI) #10A (#3D model year 2002 and later) and rear electronic module (REM) #15A
- Accessory control module (AEM) #4A and rear electronic module (REM) #14A
- Accessory control module (AEM) #3A and rear electronic module (REM) #16A
- rear electronic module (REM) #14A and driver information module (DIM) #8 and intermediate connector 54/40
- rear electronic module (REM) #16A and driver information module (DIM) #9 and intermediate connector 54/40
- central electronic module (CEM) #2D and driver information module (DIM) #9
- central electronic module (CEM) #3D and driver information module (DIM) #8
- power seat module (PSM) #3B and driver information module (DIM) #9
- power seat module (PSM) #2B and driver information module (DIM) #8
- audio module (AUM) #8A and climate control module (CCM) #12A
- audio module (AUM) #7A and climate control module (CCM) #14A
- carphone module (PHM) #10A and climate control module (CCM) #12A
- carphone module (PHM) #22A and climate control module (CCM) #14A
- passenger door module (PDM) (driver door module (DDM) in right hand drive) #3A and climate control module (CCM) #12A and intermediate connector 54/11
- passenger door module (PDM) (driver door module (DDM) in right hand drive) #2A and climate control module (CCM) #14A and intermediate connector 54/11
- climate control module (CCM) #11A and steering wheel module (SWM) #19
- climate control module (CCM) #13A and steering wheel module (SWM) #9
- steering wheel module (SWM) #20 and SRS control module #25B
- steering wheel module (SWM) #10 and SRS control module #23B
- SRS control module #26B and upper electronic module (UEM) #5 and intermediate connector 54/13
- SRS control module #24B and upper electronic module (UEM) #3 and intermediate connector 54/13
- driver door module (DDM) (passenger door module (PDM) in right hand drive) #3A and upper electronic module (UEM) #5 and intermediate connector 54/10
- driver door module (DDM) (passenger door module (PDM) in right hand drive) #2A and upper electronic module (UEM) #3 and intermediate connector 54/10.

For the XC90. The cable between:
- driver information module (DIM) #3 and climate control module (CCM) #12A
- driver information module (DIM) #2 and climate control module (CCM) #14A
- Accessory control module (AEM) #4A and rear electronic module (REM) #14A
- Accessory control module (AEM) #3A and rear electronic module (REM) #16A
- rear electronic module (REM) #14A and driver information module (DIM) #8 and intermediate connector 54/40
- rear electronic module (REM) #16A and driver information module (DIM) #9 and intermediate connector 54/40
- central electronic module (CEM) #2D and driver information module (DIM) #9
- central electronic module (CEM) #3D and driver information module (DIM) #8
- power seat module (PSM) #3B and driver information module (DIM) #9
- power seat module (PSM) #2B and driver information module (DIM) #8
- infotainment control module (ICM) #4A and climate control module (CCM) #12A
- infotainment control module (ICM) #6A and climate control module (CCM) #14A
- infotainment control module (ICM) #3A and driver information module (DIM) #3A
- infotainment control module (ICM) #5A and driver information module (DIM) #2A
- carphone module (PHM) #5A and climate control module (CCM) #12A
- carphone module (PHM) #15A and climate control module (CCM) #14A
- passenger door module (PDM) (driver door module (DDM) in right hand drive) #3A and climate control module (CCM) #12A and intermediate connector 54/11
- passenger door module (PDM) (driver door module (DDM) in right hand drive) #2A and climate control module (CCM) #14A and intermediate connector 54/11
- climate control module (CCM) #11A and steering wheel module (SWM) #19
- climate control module (CCM) #13A and steering wheel module (SWM) #9
- steering wheel module (SWM) #20 and SRS control module #25B
- steering wheel module (SWM) #10 and SRS control module #23B
- SRS control module #26B and upper electronic module (UEM) #5 and intermediate connector 54/13
- SRS control module #24B and upper electronic module (UEM) #3 and intermediate connector 54/13
- driver door module (DDM) (passenger door module (PDM) in right hand drive) #3A and upper electronic module (UEM) #5 and intermediate connector 54/10
- driver door module (DDM) (passenger door module (PDM) in right hand drive) #2A and upper electronic module (UEM) #3 and intermediate connector 54/10.

Other information
- To connect the breakout box to the driver information module (DIM), see Connecting the Driver Information Module (DIM) test box Connecting the Driver Information Module (DIM) Test Box
- To connect the breakout box to the climate control module (CCM), see Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- To connect the breakout box to the rear electronic module (REM), see Relay/Fuse Box Cargo Compartment/Rear Electronic Module (REM), Replacing
- To connect the breakout box to the AEM control module, see Connecting the breakout box. Accessory electronic module Connecting the Breakout Box, Accessory Electronic Module (AEM)
- To connect the breakout box to the central electronic module (CEM), see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- To connect the breakout box to the power seat module (PSM), see Connecting the breakout box, power seat module (PSM) Connecting the Breakout Box, Power Seat Module (PSM)
- To connect the breakout box to the audio control module, see Connecting the Breakout Box, Audio Module (AUD)
- To connect the breakout box to the infotainment control module (ICM), see Connecting the breakout box Pinout Values and Diagnostic Parameters
- To connect the breakout box to the carphone module (PHM), see Connecting the Breakout Box, Phone Module (PHM)
- To connect the breakout box to the passenger door module (PDM) or driver door module (DDM), see Connecting the breakout box Connecting the Breakout Box
- To connect the breakout box to the steering wheel module (SWM), see Connecting the breakout box Connecting the Breakout Box
- To connect the breakout box to the SRS control module, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS)
- To connect the breakout box to the upper electronic module (UEM), see Connecting the breakout box Connecting the Breakout Box





Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

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FAULT FOUND - Verification

No Fault Found - Replacing the carphone module (PHM)

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Replacing the carphone module (PHM)
Replace carphone module (PHM), see Phone Module (PHM), Replacing

Continue - Verification

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Verification




Verification

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





- Ignition off
- Connect connector, install components etc.
- Ignition on for at least 10 seconds.
Check that diagnostic trouble code status is showing Intermittent.





Is the status of the diagnostic trouble code Intermittent?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the power supply

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