Signal Too Low
Signal too low
Checking for permanent or intermittent faults
Check that the front door locks can be operated using the driver door key.
Is function OK?
Yes - Checking the wires
No - Checking the wires
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Checking the wires
Check control unit and lock unit connectors for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for a loose contact as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the wire between door control unit and lock unit on driver and passenger doors for a short circuit to ground as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
DDM/PDM-0019 Central locking input (ULK)
Door control unit A12 and driver/passenger doors 1.
DDM/PDM-001A Central locking input (LK)
Door control unit A13 and driver/passenger doors 5.
DDM/PDM-001B Central locking, key cylinder
Door control units A13 and driver/passenger doors 5, and door control unit A12 and driver/passenger doors 1.
Do the necessary corrective action.
Additional information:
- With ignition off, voltage between control unit 12B and ground should be battery voltage.
- To connect the test box, see Connecting the breakout box Connecting the Breakout Box.
- For information on signals and additional values, see Signal specification Signal Specification, Driver Door Module (DDM) / Passenger Door Module (PDM).
- To access the door control unit, see Driver's door module / passenger door module (DDM/PDM), replacing Driver's Door Module/Passenger Door Module (DDM/PDM), Replacing.
Is there a fault?
Yes - Verification
No - No Fault Found
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Checking the wires
Check control unit and lock unit connectors for intermittent contact resistance and oxidation as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for a loose contact as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the wire between door control unit and lock unit on driver and passenger doors for an intermittent short circuit to ground as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
DDM/PDM-0019 Central locking input (ULK)
Door control unit A12 and driver/passenger doors 1.
DDM/PDM-001A Central locking input (LK)
Door control unit A13 and driver/passenger doors 5.
DDM/PDM-001B Central locking, key cylinder
Door control units A13 and driver/passenger doors 5, and door control unit A12 and driver/passenger doors 1.
Do the necessary corrective action.
Additional information:
- With ignition off, voltage between control unit 12B and ground should be battery voltage.
- To connect the test box, see Connecting the breakout box Connecting the Breakout Box.
- For information on signals and additional values, see Signal specification Signal Specification, Driver Door Module (DDM) / Passenger Door Module (PDM).
- To access the door control unit, see Driver's door module / passenger door module (DDM/PDM), replacing Driver's Door Module/Passenger Door Module (DDM/PDM), Replacing.
Continue - Trouble-shooting information
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Verification
Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect connectors, install components, etc.
Check that the front door locks can be operated using the driver door key.
Is function OK?
Yes - Verification completed
No - Trouble-shooting information
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Trouble-shooting 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 for permanent or intermittent faults
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Trouble-shooting 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 - Exit fault-tracing
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Attempt New Test - Checking for permanent or intermittent faults
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