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Test Points





Fault, fault code
Possible causes, elimination, notes

Test point 1
Ignition circuit, driver

Fault codes 04, 05, 20, 21, 36


Fig. 1:






1. Remove driver's airbag unit.
2. Attach the special tool 9516 instead of the airbag unit.


Fig. 2:






3. Clear the fault memory.
4. Check whether the fault appears again.
a) If the fault does not appear again, replace the airbag unit.
b) If the fault appears again, disconnect plug connection to the contact unit and attach special tool 9516/1.
5. Clear the fault memory.
6. Check whether the fault appears again.
a) If the fault does not appear again, replace the contact unit.
b) If the fault appears again, check the wiring harness for pinches and chafing damage.
c) If no fault is found on the wiring harness, replace the triggering unit.

Proceed as described below to determine whether the fault was eliminated:
1. Clear the fault memory.
2. Switch off ignition.
3. Remove ignition key.
4. Switch on ignition.

Test point 2
Ignition circuit, passenger

Fault codes 10, 11, 26, 27, 39


Fig. 3:






1. Disconnect the plug connection to the passenger's airbag unit.
2. Attach the special tool 9516 in conjunction with special tool 9566.
3. Clear the fault memory.
4. Check whether the fault appears again.
a) If the fault does not appear again, replace the passenger's airbag unit.
b) If the fault appears again, check the wiring harness for pinches and chafing damage.
c) If no fault is found on the wiring harness, replace the triggering unit.

Proceed as described below to determine whether the fault was eliminated:
1. Clear the fault memory.
2. Switch off ignition.
3. Remove ignition key.
4. Switch on ignition.

Test point 3
Supply voltage

Fault code 03
1. Inspect the battery and generator.
2. Inspect the plug connection on the triggering unit for corrosion.


NOTE: The warning light is on as long as the limit value is exceeded or not reached.


Test point 4
Airbag warning light

Fault codes 01, 02
1. Inspect the fuse for the supply voltage (terminal 15) for the instrument cluster.
2. Inspect the bulb and replace it if necessary.
3. Inspect the lead from the triggering unit pin 7 to the warning light for continuity and short circuit to positive.

Test point 5
Belt buckle, driver

Fault codes 44, 45, 46, 50
1. Disconnect the plug connection X16.
2. Connect ohmmeter on the pin side on pins B7 and B8.
Display: approx. 400 ohm


NOTE: The belt tongue must not be inserted in the buckle.


3. Connect ohmmeter on the pin side on pin B7 and ground.
Display: Infinity ohm
4. Connect ohmmeter on the pin side on pins B7 and B8.
Insert the belt tongue in the buckle.
Display: approx. 100 ohm
5. Inspect the wiring harness to the triggering unit for pinches and chafing damage.


NOTE: The warning light is on as long as the limit value is exceeded or not reached.


Test point 6
Belt buckle, passenger

Fault codes 47, 48, 49, 51
1. Disconnect the plug connection X17.
2. Connect ohmmeter on the pin side on pins B7 and B8.
Display: approx. 400 ohm


NOTE: The belt tongue must not be inserted in the buckle.


3. Connect ohmmeter on the pin side on pin B7 and ground.
Display: infinity ohms
4. Connect ohmmeter on the pin side on pins B7 and B8. Insert the belt tongue in the buckle.
Display: approx. 100 ohm
5. Inspect the wiring harness to the triggering unit for pinches and chafing damage.

Test point 7
Child seat detection

Fault codes 70, 71, 72, 73
1. Pull plug off the control module.
2. Connect ohmmeter to plug, pin 23 and ground.
Plug of child seat not inserted.
Display: approx. 2 kohm
Plug of child seat inserted.
Display: approx. 260 ohm
3. Inspect the wiring harness to the control module for pinches and chafing damage.

Test point 8
Ignition circuit, side airbag

Fault codes 12, 13, 14, 15, 28, 29, 30, 31, 40, 41


Fig. 4:






1. Pull off plug on the side airbag unit.
2. Connect special tools 9516 and 9516/2.
3. Clear fault memory.
4. Check whether the fault appears again.
a) If the fault does not appear again, replace the side airbag.
b) If the fault appears again with the special tool, check the wiring harness for pinches and chafing damage.
c) If no faults are found on the wiring harness, replace the control module.

Test point 9
Side-airbag sensor
(sensor for airbag)

Fault codes 85, 87
These fault is stored in the following cases:
1. There is an open circuit in the wire to the sensor.
2. There is a short to ground / B+ between pin 3 Sensor for airbag and control module pin 20 or pin 21.
3. The sensor or control module is faulty.

Check wire to the sensor for open circuit/ leakage resistance. If no fault is detected in the wire, replace sensor.

Test point 10
Side-airbag sensor
(sensor for airbag)

Fault codes 86, 88
These faults are stored if there is a defect in the sensor.
Replace side airbag sensor.

Test point 11
Side-airbag sensor
(sensor for airbag)

Fault codes 53, 56
These faults are stored if an incorrect side airbag sensor is installed.
Replace side airbag sensor.

Test point 12
Unknown fault code

Fault code XXX
1. Inspect the ground points for corrosion.
2. Inspect the ignition on the secondary side.
3. Clear fault memory.
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