Trouble Diagnosis/Clearing Codes Using Impulse Counter

Notes on the Pulse Display:
If, in case of a complaint, no fault is indicated via the impulse counter display, carry out function test ("Testing if no Fault Display Appears"). Test Program With Socket Box or Multimeter

The number 1 signifies that no fault is recorded in the electronic system. All other numbers are assigned to a certain fault circuit.

The numbers 1 through 10 appear on the display of the impulse counter.

- If the light-emitting diode "U Batt" lights up after connection, both the pulse meter and the power supply for the pulse meter are in order.

Testing:
- Connect impulse counter in acccordance with connection diagram. Connecting Impulse Counter

NOTE: Light-emitting diode "U Batt" in the display must light up. If it fails to do so switch multimeter to "volts" position and:
a) Test socket 1 of test coupling X92 to battery positive (11 - 14V).
b) Test socket 6 of test coupling X92 to socket 1 (6 - 12V).

- Press start button for between 2 and 4 seconds.
- Read off displayed pulse output and note down.
- Press start button again for between 2 and 4 seconds. The previous number appears again if there are no more faults in the system.
- Eliminate noted faults (pulse output) in accordance with the fault Test Program. Test Program With Socket Box or Multimeter
- Test individual components.

Clearing the Fault Memory:
The displayed pulse must be cleared as follows after a fault has been rectified:
- Press start button and call up the eliminated fault, then press start button for at least 6 - 8 seconds.

NOTE: Each pulse displayed must be cleared individually.

- If no display the stored fault has been cleared.
- If number displayed (> 1) there are further faults in system.


The number of pulses indicates whether there is a fault and which fault is present, or which component is faulty.

Pulse display 10 signifies that the control unit has triggered the airbag unit end-stages. This display cannot be cancelled. The control unit must be replaced.

Connection Diagram for Socket Box:

NOTE: The negative terminal of the battery must be disconnected and covered before disconnecting the test coupling/plug connection for airbag (10-pin).





01 Test connection, 10-pin airbag plug connector.
02 Test lead
03 Multimeter
04 Socket box