19 - 26

Test point 19
Pot. mirror right horizontal short circuit

Fault code 21
This fault is stored in the following cases:
1. There is a short circuit in the wire to the pot. right rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- 1. Replace support with transmission.
- 2. Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.

- If the fault is still present, there is a fault in the wire. For a fault in the wire, proceed as described below:
- Disconnect plug at support with transmission.
- Disconnect mirror plug from the control module.
- Use an ohmmeter to check for short circuit on the support plug Pin 5, wire colour yellow, and Pin 7, wire colour pink.

If no short circuit is detected:
- Use an ohmmeter to check for open circuit on the support plug Pin 3 and the mirror plug on the control module Pin 5
Ohmmeter display < 5 Ohm
- If the fault is still present, replace control module.

Test point 20
Pot. mirror right vertical open circuit

Fault code 22
This fault is stored in the following cases:
1. There is an open circuit in the wire to the pot right rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- Replace support with transmission.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.
If the fault is no longer present, erase the fault memory.
If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect mirror plug from the control module.
- Disconnect plug at support with transmission.
- Use an ohmmeter to check for open circuit on the support plug Pin 5 and the mirror plug on the control module Pin 11
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for open circuit on the support plug Pin 7 and the mirror plug on the control module Pin 4.
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for continuity on the support plug Pin 1 and Pin 3.
- If no fault is detected in the wire, replace the control module.

Test point 21
Pot. mirror right vertical short circuit

Fault code 23
This fault is stored in the following cases:
1. There is a short circuit in the wire to the pot right rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- Replace support with transmission.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.
If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect plug at support with transmission.
- Disconnect mirror plug from the control module.
- Use an ohmmeter to check for short circuit on the support plug Pin 1, wire colour grey, and Pin 7, wire colour pink. No continuity must be measured, if no short circuit is detected:
- Use an ohmmeter to check for open circuit on the support plug Pin 3 and the mirror plug on the control module Pin 5
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for continuity on the support plug Pin 1 and Pin 7.
- If no fault is detected in the wire but the fault is still present, replace the control module.

Test point 22
Pot. mirror left horizontal open circuit

Fault code 24
This fault is stored in the following cases:
1. There is an open circuit in the wire to the pot left rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- Replace support with gear unit.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.

- If the fault is no longer present, erase the fault memory.
- If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect mirror plug from the control module.
- Disconnect plug at support with gear unit
- Use an ohmmeter to check for open circuit on the support plug Pin 1 and the mirror plug on the control module Pin 10
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for open circuit on the support plug Pin 7 and the mirror plug on the control module Pin 4.
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for continuity on the support plug Pin 1 and Pin 3.
- If no fault is detected in the wire, replace the control module.

Test point 23
Pot. mirror left horizontal short circuit

Fault code 25
This fault is stored in the following cases:
1. There is a short circuit in the wire to the pot left rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- Replace support with gear unit.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present it the cause of the fault has really been eliminated.

- If the fault is no longer present, erase the fault memory.
- If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect plug at support with gear unit
- Disconnect mirror plug from the control module.
- Use an ohmmeter to check for continuity on the support plug Pin 1 and Pin 7.
- Use an ohmmeter to check for open circuit on the support plug Pin 3 and the mirror plug on the control module Pin 5
Ohmmeter display < 5 ohms
- If no fault is detected in the wire but the fault is still present, replace the control module.

Test point 24
Pot. mirror left vertical open circuit

Fault code 26
This fault is stored in the following cases:
1. There is an open circuit in the wire to the pot left rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty.

Elimination:
- Replace support with gear unit.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.

- If the fault is no longer present, erase the fault memory.
- If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect mirror plug from the control module.
- Disconnect plug at support with gear unit
- Use an ohmmeter to check for open circuit on the support plug Pin 5 and the mirror plug on the control module Pin 11
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for open circuit on the support plug Pin 7 and the mirror plug on the control module Pin 4.
Ohmmeter display < 5 ohms
- Use an ohmmeter to check for continuity on the support plug Pin 3 and Pin 5.
- If no fault is detected in the wire, replace the control module.

Test point 25
Pot. mirror left vertical short circuit

Fault code 27
This fault is stored in the following cases:
1. There is a short circuit in the wire to the pot. left rearview mirror.
2. The potentiometer is faulty.
3. The control module is faulty

Elimination:
- Replace support with gear unit.
- Actuate switch for memory seat adjustment.

The text in the fault memory changes from present to not present if the cause of the fault has really been eliminated.

- If the fault is no longer present, erase the fault memory.
- If the fault is still present, there is a fault in the wire.

For a fault in the wire, proceed as described below:
- Disconnect plug at support with gear unit
- Disconnect mirror plug from the control module.
- Use an ohmmeter to check for continuity on the support plug Pin 5 and Pin 7.
- Use an ohmmeter to check for open circuit on the support plug Pin 3 and the mirror plug on the control module Pin 5
Ohmmeter display < 5 ohms
- If no fault is detected in the wire but the fault is still present, replace the control module.

Test point 26
Button M, 1, 2, 3 or operating buttons actuated for longer than 60 s

Fault code 32
This fault is stored in the following case:
- Switch for memory seat adjustment (1, 2, or 3), or switch for seat adjustment (e.g. Fore-and-aft adjustment forward) is continuously switched.

Elimination:
- Erase fault memory and read out again.
If the fault appears again, proceed as described below:
- Select menu item Input signals.

The following button positions can be read out in the menu item Input signals.
- Button M
- Button 1
- Button 2
- Button 3
- Fore-and-aft adjustment forward
- Fore-and-aft adjustment backward
- Backrest forward
- Backrest backward
- Front height upward
- Front height downward
- Rear height upward
- Rear height downward
- Backrest forward
- Backrest backward
- Button up
- Button down
- Button backward
- Button forward
- Select a maximum of 8 button positions.
- Search for the key on the screen that is continuously actuated. See comparison tables under Inputs.
- If a key is detected as faulty, replace the switch for memory seat adjustment or the switch for seat adjustment as appropriate.