Checking seat heating

1. Remove switch cover (4 screws).

2. Disengage seat heating switch and pull out switch (take care not to damage the wire).

3. Switch on ignition.

4. Connect voltmeter to term. 1 (positive) and term. 2 (negative).

1343 - 72

Display: approx. 5 V Note

If no voltage is displayed, check power supply according to wiring diagram.

5. Connect voltmeter to term. 2 (negative) and term. 3 (positive).

Display, depending on potentiometer setting: approx. 2 - 3 V

6. Push tip switch into "on" position and keep it in this position.

Display: approx. 5 V

7. Push tip switch into "off" position and keep it in this position.

Display: approx. 0 V

8. Turn knurled wheel of potentiometer all the way up.

Display: approx. 3 V

9. Turn knurled wheel of potentiometer all the way down. The voltage must then drop to approx. 2 V.

10. Remove seat and connect to Special Tool 9269.

11. Switch on seat heating and set to maximum heating output.

12. Measure voltage at 2-pin connector marked with digit 3.

1344-72

When the seat heating is switched on, the voltage oscillates between 0 V and approx. 12 V (clocked voltage).

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