Test Point 13 - Activation of AC Relay

TEST POINT 13 - Activation of AC relay - Fault code 1_29

Possible Causes, Elimination, Remarks
Using the System Tester 9288, activation of the AC relay may be checked directly in the Drive links menu item.
If no sound is audible, check the following:

1) AC switch signal:
Digital Motor Electronics (DME) plug disconnected, ignition on.
- Connect voltmeter between terminal 40 and terminal 24.
AC switch on: Display approx. 12 Volt If not:
- Check in accordance with wiring diagram if the air conditioning system is inoperative, the fault may be due to the 115 C coolant temperature switch.
- To check the switch, connect ohmmeter with terminal 41 of the disconnected control unit plug and ground. Ignition on.

Display: infinite resistance
If not, check in accordance with wiring diagram.

2) Voltage at A/C relay:
- Connect DME plug. Remove A/C relay (G19) from Central Electrical System.
- Connect voltmeter with relay base terminal 2 and terminal 7. Operate A/C switch with engine running.
- Display: Battery voltage after approx. 5 seconds.
- No display: Check wiring between A/C relay and DME control unit.