24 - 43
Test point 24
Control module faulty
Fault code 24
Replace control module.
Test point 25
No terminal 86 S recognized
Fault code 25
1. Check the fuse I 5/1.
2. Pull off plug I on the alarm control module.
3. Voltmeter at plug I alarm control module pin 16 and ground.
Insert the ignition key into the ignition lock.
Display: Battery voltage
4. Pull off the plug on the ignition lock.
5. Ohmmeter at ignition lock plug pin 86 S and plug I, alarm control module pin 16.
Display: < 5 ohm
6. If no fault is detected, replace the electrical contact part of the ignition lock.
Test point 26
Variant fault (new coding required)
Fault code 26
Recode equipment variant.
Test point 27
Control module faulty
Fault code 27
Replace control module.
Test point 28
Control module faulty
Fault code 28
Replace control module.
Test point 29
Control module faulty
Fault code 29
Replace control module.
Test point 30
Control module faulty
Fault code 30
Replace control module.
Test point 31
Transponder (re-teaching necessary)
Fault code 31
Re-teach key.
Test point 32
Passenger compartment monitoring sensor
Short to B+ or faulty
Fault code 32
1. Check power supply for passenger compartment monitoring sensor.
Disconnect plug connection to the passenger compartment monitoring sensor.
Voltmeter at plug connection, passenger compartment sensor monitoring pin 1 (positive) and pin 4 (negative).
Display: Battery voltage
2. Pull off plug I on the alarm control module.
3. Voltmeter at plug I alarm control module pin 24 and ground.
Display: 0 Volt
If battery voltage is displayed, check the wiring harness for pinches and chafing damage.
4. If no fault is detected, replace the alarm control module.
Test point 33
Passenger compartment monitoring sensor faulty
Fault code 33
Replace passenger compartment monitoring sensor.
Test point 34
Passenger compartment monitoring sensor
Short to 8+ or faulty
Fault code 34
1. Pull off plug I on the alarm control module.
2. Pull off the plug at the passenger compartment monitoring sensor.
3. Voltmeter at plug I alarm control module pin 24 and ground.
Switch ignition on.
Display: 0 Volt
If battery voltage is displayed, check the wiring harness for pinches and chafing damage.
If no fault is detected in the wiring, replace the passenger compartment monitoring sensor.
Test point 35
Passenger compartment monitoring sensor faulty
Fault code 35
See test point 34 above.
Test point 36
Passenger compartment monitoring sensor
Short to 8+ or faulty
Fault code 36
Replace passenger compartment monitoring sensor.
Test point 37
Passenger compartment monitoring sensor faulty
Fault code 37
Replace passenger compartment monitoring sensor.
Test point 38
Signal converter faulty
Fault code 39
1. Check the power supply for the signal converter:
Disconnect the plug on the signal converter.
Voltmeter at plug housing pin 4 (negative) and pin 5 (positive).
Ignition key inserted.
Display: Battery voltage.
2. Check the control lead for the signal converter (pin 6) to the alarm control module plug I pin 4 for continuity, short to B+ and short to ground.
3. Check the status lead for the signal converter (pin 7) to the alarm control module plug I pin 12 for continuity, short to B+ and short to ground.
4. Check the data lead for the signal converter (pin 8) to the alarm control module plug I pin 3 for continuity, short to B+ and short to ground.
Test point 39
Signal converter, coil fault
Fault code 40
Check the transponder coil:
Disconnect the plug on the signal converter.
Connect ohmmeter to pins 1 and 2
Display: 20 - 25 ohm at 20 °C
Connect ohmmeter to pin 1 and ground
Display: Infinity ohm
Test point 40
Transponder pill faulty or not present
Fault code 41
1. Check transponder for presence in the key.
2. Replace the transponder.
Test point 41
Wrong key or wrong transponder pill
Fault code 42
1. Check transponder for presence in the key.
2. Wrong transponder - not adapted to the vehicle - teach the transponder.
3. Check the control lead for the signal converter (pin 6) to the alarm system control module plug I pin 4 for open circuit, short to ground and short to B+.
Pull plug I off the alarm system control module
Pull plug off the signal converter
Voltmeter at alarm system control module plug I pin 4 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug I pin 4 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug I pin 4 and signal converter plug pin 6
Ohmmeter display: < 5 ohm
4. Check the control lead for the signal converter (pin 8) to the alarm system control module plug I pin 3 for open circuit, short to ground and short to B+.
Pull plug I off the alarm system control module
Pull plug off the signal converter
Voltmeter at alarm system control module plug I pin 3 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug I pin 3 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug I pin 3 and signal converter plug pin 8
Ohmmeter display: < 5 ohm
If no faults are detected in the wire, replace the signal converter.
Test point 42
Release on passenger's side jams
Fault code 43
This fault is stored if the safe drive motor cannot be actuated, the safe contact (microswitch) is not connected to ground after release, or the alarm system control module is coded incorrectly (country coding).
1. Check the country coding in the menu item Coding
2. Select (Drive links) "Secure doors" with PST 2, and check whether the drive motors react.
If the drive motors react, select "Driver's side secured" and "Passenger's side secured" in the menu item input signals, and close the doors.
Vehicle not secured
PST2 display Driver's side not secured
Passenger's side not secured
If the display of the PST2 deviates from this information or if the drive motor does not react, a fault is present in the supply lead or in the door lock (microswitch, drive motor).
Pull plugs I and II off the control module
Pull plug off door lock on passenger's side
Voltmeter at alarm system control module plug II pin 3 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug II pin 3 and ground
Ohmmeter display: Infinity ohm
Ohmmeter on alarm system control module plug II pin 3 and plug on passenger side door lock pin 1
Ohmmeter display: < 5 ohm
Voltmeter at alarm system control module plug I pin 28 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug I pin 28 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug I pin 28 and plug on passenger side door lock pin 7
Ohmmeter display: < 5 ohm
Pull plug off switch for central locking
Voltmeter at alarm system control module plug I pin 29 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug I pin 29 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug I pin 29 and plug on switch for central locking pin 1
Ohmmeter display: < 5 ohm
If no faults are detected in the wire, replace the door lock on the passenger's side.
Test point 43
Release on driver's side jams
Fault code 44
This fault is stored if the safe drive motor cannot be actuated, the safe contact (microswitch) is not connected to ground after release, or the alarm system control module is coded incorrectly (country coding).
1. Check the country coding in the menu item Coding
2. Select (Drive links) "Secure doors" with PST 2, and check whether the drive motors react.
If the drive motors react, select "Driver's side secured" and "Passenger's side secured" in the menu item Input signals, and close the doors
Vehicle not secured
PST2 display: Driver's side not secured
Passenger's side not secured
If the display of the PST2 deviates from this information or if the drive motor does not react, a fault is present in the supply lead or in the door lock (microswitch, drive motor)
Pull plugs I and II off the control module Pull plug off door lock on driver's side
Voltmeter at alarm system control module plug II pin 3 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug II pin 3 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug II pin 3 and plug on driver side door lock pin 1
Ohmmeter display: < 5 ohm
Voltmeter at alarm system control module plug I pin 5 and ground
Voltmeter display: 0 V
Ohmmeter at alarm system control module plug I pin 5 and ground
Ohmmeter display: Infinity ohm
Ohmmeter at alarm system control module plug I pin 5 and plug on driver side door lock pin 7
Ohmmeter display: < 5 ohm
Ohmmeter at alarm system control module plug I pin 28 and plug on door lock pin 7
Ohmmeter display: < 5 ohm
If no faults are detected in the wire, replace the door lock on the driver's side.