Reply To: From the Service Manual for a

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junker
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From the Service Manual for a 2004:
Self-diagnosis Function
There are four modes of self-diagnosis; entering diagnostics, requesting number of fault codes, requesting fault codes, and idling or clearing fault codes. These steps must be followed in order. Self-diagnosis can be manually exited by turning the ignition OFF, or selecting reverse gear. Self-diagnosis will automatically exit if a message is repeated five times without acknowledgement, before reporting number of faults if no switch activity is detected for thirty seconds or in idle mode if no switch activity is detected for thirty seconds.

ENTERING DIAGNOSTICS MODE
1. Turn ignition switch ON. Rear sonar system OFF switch indicator lamp comes on for three seconds and then goes out.
2. Immediately push rear sonar system OFF switch ten times within five seconds.
3. The the sonar buzzer sounds once and the rear sonar system OFF indicator flashes once.

REQUESTING NUMBER OF FAULT CODES MODE
1. While in diagnostic mode, push rear sonar system OFF switch once.
2. The sonar buzzer will sound once.
3. Rear sonar system OFF indicator will flash once and sonar buzzer will sound once for each fault code detected.
4. There will be a four second pause.
5. The number of fault codes will repeat then pause five times.
NOTE: Self-diagnosis will exit unless requesting fault codes occurs before five repeats ends.

REQUESTING FAULT CODES MODE
1. While in requesting number of fault codes mode, push rear sonar system OFF switch once.
2. The sonar buzzer will sound once.
3. Rear sonar system OFF Indicator will flash and sonar buzzer will sound the first digit of the fault code followed by a one second pause.
4. Rear sonar system OFF Indicator will flash and sonar buzzer will sound the second digit of the fault code followed by a four second pause.
5. The fault codes will repeat then pause five times.
NOTE:Requesting fault codes will exit unless the fault code is acknowledged before five repeats ends. The fault code is acknowledged by pushing the rear sonar system OFF switch once (the sonar buzzer may sound). When all fault codes have been indicated, idle mode will be entered. See the following table for fault code identification.

Fault Code Malfunction Page Reference
1 1 Rear sonar sensor LH outer
1 2 Rear sonar sensor LH inner
1 3 Rear sonar sensor RH inner
1 4 Rear sonar sensor RH outer
Check harness for open or short. If NG repair or replace harness. If OK replace sensor.

2 1 Sonar buzzer
2 2 Rear sonar system OFF indicator
2 3 Rear sonar system OFF switch
2 4 Sonar control unit. Replace sonar control unit.