Test Point 22 - Leads K and L

TEST POINT 22: Leads K and L

The diagnostic connection between the LH control unit and the diagnosis testers is by way of the two leads K and L If no diagnosis is possible, the following tests must be carried out:

1. Continuity test (refer to wiring diagram)
Lead L: Pin 7 (19-pole diagnostic socket) - Pin 16 (LH plug)
Lead K: Pin 8 (19-pole diagnostic socket) - Pin 12 (LH plug)

2. Ground short test (refer to wiring diagram)
Lead L: With the ignition switched on, the voltage at Pin 7 (19-pole diagnostic socket) must be > 8 V.
Lead K: With the ignition switched on, the voltage at Pin 8 (19-pole diagnostic socket) must be > 8 V.

Possible fault causes:
- Ground short or break in wiring or at plug connections.
- Faulty control unit connected to these leads (this may be any control unit with diagnostic capability and must not necessarily be the LH control unit).

Checking:
- Disconnect plugs in succession at the control units with diagnostic capability until the voltage > 8 V. Renew the control unit which is causing the fault.

- Tester faulty.
- No power supply at the diagnostic plug.
- No ground at the diagnostic plug.