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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Powertrain Diagnostic Procedures - Diesel) >> Diagnostic Information And Procedures >> DRIVEABILITY - Diesel - Symptoms >> Symptom: *CHECKING THE VISCOUS/CABIN HEATER RELAY >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - CHECKING THE VISCOUS/CABIN HEATER RELAY

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, actuate the Viscous/Cabin Heater Relay.
Is the Cabin Heater Relay clicking during the actuator test?
Yes --> Test Complete.
No --> Go To 2		 All
2
NOTE: If the Cabin Heater Relay fuse or fuselink is open, refer to SCHEMATIC DIAGRAMS  for all circuits that are powered by the Cabin Heater Relay fuse or fuselink to determine the cause of the blown fuse/fuselink.
Remove the Cabin Heater Relay.Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the Cabin Heater Relay connector.Does the test light illuminate brightly?Yes --> Go To 3No --> Repair the Fused B+ (Fuse/Fuselink) circuit for an open.Perform ROAD TEST VERIFICATION - VER-2 .		 All
3 Turn the ignition off.
Disconnect the Cabin Heater harness connector.
Remove the Cabin Heater Relay.
Turn the ignition on.
Measure the voltage on the Cabin Heater Relay Output circuit.
Is the voltage above 1.0 volt?
Yes --> Repair the Cabin Heater Relay Output circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 4		 All
4 Turn the ignition off.
Disconnect the Cabin Heater harness connector.
Remove the Cabin Heater Relay.
Measure the resistance between ground and the Cabin Heater Relay Output circuit.
Is the resistance above 1000 ohms?
Yes --> Go To 5
No --> Repair the Cabin Heater Relay Output circuit for a short to ground. Inspect the fuse or fuselink and replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
5 Turn the ignition off.
Disconnect the Cabin Heater harness connector.
Remove the Cabin Heater Relay.
Connect a jumper wire across Cabin Heater Relay connector cavities 30 and 87.
Using a 12-volt test light connected to ground, check the Cabin Heater Relay Output circuit in the Cabin Heater harness connector.
Does the test light illuminate brightly?
Yes --> Go To 6
No --> Repair the Cabin Heater Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
6 If there are no possible causes remaining, view repair.
Repair
Replace the Cabin Heater Relay.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
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