Short circuit to ground
Short circuit to B+
1 Check both relays.
1. Remove relay.
2. Connect ohmmeter to terminals 85 and 86.
Display: approx. 75 ohms
2 Check wiring from DME control module, pin IV/20, to relays for continuity.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove relay stage 2 of coolant fan 1.
3. Remove relay stage 2 of coolant fan 2.
4. Connect ohmmeter to special tool 9637, pin IV/20, and relay slot of coolant fan 1, pin 2 (terminal 85).
Display: 0 - 5 ohms
5. Connect ohmmeter to special tool 9637, pin IV/20, and relay slot of coolant fan 2, pin 2 (terminal 85).
Display: 0 - 5 ohms
If infinity ohms is displayed, check connector X 2/3, pin 22, and wiring harness for chafing and pinching damage.
3 Perform adaptation.
1. Switch on the ignition.
2. Wait one minute.
Do not press the accelerator.