Signal Missing
Signal missing
Checking the connectors
- Ignition off.
Check the connectors and wiring for the suspension module (SUM) and the battery connection. Check for contact resistance and oxidation. Check for loose connections.
Check for damage carefully.
Other information
- To access the control module, see Suspension module (SUM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Select Continue.
Continue - Checking components and wiring
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Checking components and wiring
- Ignition off.
Check that the fuses for the suspension module (SUM) are intact.
Check the relay for 15i power supply.
Hint: In the event of a fault in the 15i power supply relay, diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM). If diagnostic trouble codes (DTCs) are stored for the relay, fault trace accordingly.
Check the cable between the fuse and 15i power supply relay terminal #3. Check for an open-circuit. Check for a short-circuit to ground.
Check the cable between 15i power supply relay terminal #1 and suspension module (SUM) terminal #C1 (#31). Check for an open-circuit. Check for a short-circuit to ground.
Check the cable between suspension module (SUM) terminal #C2 (#32) and ground. Check for an open-circuit. Check for a short-circuit to supply voltage.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Suspension Module (SUM)
- For further information about signals and other values, see Signal specification Signal Specification, Suspension Module (SUM)
- Checking wiring and terminals Checking Wiring And Terminals
- For further information about the fuses and relays, see the Wiring Diagram.
Was a fault detected?
Yes - Verification
No - Checking the bus cable
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Checking the bus cable
- Disconnect the suspension module (SUM) from the bus cable. Pull the connector out of the control module.
- To obtain the correct value, the battery must be disconnected during resistance measurement.
Measure the resistance of the connectors across terminals #A15 and #A16.
Note! Take care that you measure directly at the connector so that it is not damaged.
Hint: Only connect a breakout box to the connector, not to the control module. In this way, the direction of any faults in the bus cable can be established.
The resistance must be approximately 120 Ohms. If another reading is given, there may be an open-circuit in the bus cable.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Suspension Module (SUM)
- For further information about signals and other values, see Signal specification Signal Specification, Suspension Module (SUM)
- To disconnect the battery, see Battery, disconnecting Battery Disconnecting.
ohms
Does the measuring instrument display a resistance of approximately 120?
Yes - No Fault Found
No - Checking for an open-circuit
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Checking for an open-circuit
Open-circuit in the Control area network (CAN) bus. High speed network. Permanent fault
Checking the high 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.
Information
- To access the bus cable, see applicable wiring diagrams.
Check the bus cable. Check for an open-circuit. See Checking wiring and terminals Checking Wiring And Terminals. 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.
The cable between:
- electronic throttle module terminal #4 and engine control module (ECM) terminal #55A
- electronic throttle module terminal #3 and engine control module (ECM) terminal #37A
Note! Applies only to automatic transmission.
engine control module (ECM) terminal #1B and transmission control module (TCM) terminal #1B
Note! Applies only to automatic transmission.
engine control module (ECM) terminal #13B and transmission control module (TCM) terminal #13B
Note! Applies only to automatic transmission.
transmission control module (TCM) terminal #2B and the ABS control module (brake control module (BCM)) terminal #15
Note! Applies only to automatic transmission.
transmission control module (TCM) terminal #14B and the ABS control module (brake control module (BCM)) terminal #11
Note! Applies only to manual transmission.
There is no transmission control module (TCM) when there is a manual transmission. Therefore the following cables must be checked:
engine control module (ECM) terminal #1B and the ABS control module (brake control module (BCM)) terminal #15.
engine control module (ECM) terminal #13B and the ABS control module (brake control module (BCM)) terminal #11
- central electronic module (CEM) terminal #18B and ABS control module (brake control module (BCM)) terminal #15 and intermediate connector 54/3R
- central electronic module (CEM) terminal #17B and ABS control module (brake control module (BCM)) terminal #11 and intermediate connector 54/3R
- the central electronic module (CEM) terminal #18B and the Steering wheel Angle Sensor Module (SAS) terminal #15A
- the central electronic module (CEM) terminal #17B and the Steering wheel Angle Sensor Module (SAS) terminal #6A
Note! Applies for the S60AWD and XC90.
- the central electronic module (CEM) terminal #18B and the control module for four wheel drive (AOC) terminal #7A
- the central electronic module (CEM) terminal #17B and the control module for four wheel drive (AOC) terminal #8A.
Other information
- To connect the breakout box to the electronic throttle module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To connect the breakout box to the engine control module (ECM), see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To connect the breakout box to the transmission control module (TCM) (AW), see Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
- To connect the breakout box to the transmission control module (TCM) (GM), see
- To connect the breakout box to the brake control module (BCM), see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- 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 steering wheel angle sensor module (SAS), see Connecting the breakout box to the steering angle sensor Connecting the Breakout Box, Steering Wheel Angle Sensor Module (SAS)
Was a fault detected?
Yes - Fault Found
No - No Fault Found
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FAULT FOUND - Verification
No Fault Found - Fault-tracing information
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Switch on the ignition for at least 10 seconds.
Read off the control module ID from the suspension module (SUM) by clicking on the VCT2000 symbol.
Could the control module ID be read off?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - 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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking the connectors
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