Test Point 1

Test point 1
Interface to the instrument cluster
Open circuit
Short to ground

DTC 20

Diagnosis conditions
No control module fault stored.
No fault on the supply voltage (terminal 15).

Open circuit
1. Pull off connector B on the heating/air conditioning control.
2. Pull off connector III on the instrument cluster.
3. Connect ohmmeter to connector B 13 and to connector III pin 26.
Display: < 5 Ohms

NOTE: The wire is routed via the 12-pole plug connection on the heater/ A/C unit.

Short to ground
1. Pull off connector B on the heating/air conditioning control.
2. Pull off connector III on the instrument cluster.
3. Connect ohmmeter to connector B 13 and ground.
Display: < Infinity Ohms

If 0 - 5 Ohms is displayed, check the wiring for pinching and chafing.