Connecting Tester

Special Tools:

WARNING: The tester 126 589 10 21 00 must always be used when testing the airbag and belt tensioner restraint system. If other testers are used, there is a danger of triggering the airbag and belt tensioner restraint system.





1 Indicator lamp for internal power supply
2 Indicator lamp for reserve power source
3 Digital display
4 Test jacks for external voltage and resistance measurements
5 Test selector switch
6 Ground button (to test the insulation resistance)
7 Connection for external power supply
8 Cable for external power supply
9 Test cable for external voltage and resistance measurements

Connecting Tester:
1. Turn ignition key to position "0", disconnect negative terminal of battery and cover.
2. Expose test coupling/plug connection for airbag, 10-pin (X29/9): on passenger's side foot rest or on the plate below this.





WARNING: Before disconnecting the 10-pin plug connection (X29/9) to connect or disconnect the tester, always turn the ignition key to position "0" and disconnect and cover the negative terminal of the battery.
It is essential to ensure that the disconnected battery terminal cannot automatically come into contact with the negative pole.





3. Disconnect 10-pin plug connection (X29/9) and connect tester with the 10-pin plug of the cable harness.
4. Reconnect battery for test.

Connecting Tester for use for External Voltage or Resistance Measurements.





1. Connect cables (8) for tester power supply to connection (7) and couple to positive and negative poles of battery.
2. Plug test cables (9) into test jacks (4).





3. When measuring voltages, turn test selector switch to position "8". The display is in volts (V).
4. When measuring resistances, turn test selector switch to position "9". The display is in ohms.

NOTE: If the tester is used for external voltage or resistance measurements, it must be disconnected from the 10-pin plug of the airbag and belt tensioner cable harness.