2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 669

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 669

Circuit/System Testing

1. Ignition OFF, disconnect the park lamp relay.

2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.

瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.

3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the

B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the fog lamp

relay.

4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

5. Disconnect the harness connector at the appropriate park lamp.

6. Test for less than 5 ohm between the park lamp ground circuit terminal and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

7. Connect the harness connector at the park lamp.

8. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park lamp is activated.

瀚慖f the park lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests

normal, test or replace the park lamp.

瀚慖f the park lamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test

or replace the park lamp.

9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.

10. Command the Parking Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded

states.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the BCM.

11. If all circuits test normal, test or replace the park lamp relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Headlamp Replacement (Cadillac Escalade) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp

Replacement (Cadillac Escalade))Headlamp Replacement (GMC Yukon Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service

and Repair/Removal and Replacement/Headlamp Replacement (GMC Yukon Two-mode Hybrid))Headlamp Replacement (Yukon) (See:

Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Yukon))Headlamp Replacement

(Chevrolet Tahoe Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp

Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and

Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement

(Escalade PLATINUM) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement

(Escalade Platinum))Headlamp Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Replacement (Non HID))

* Repeater Lamp Replacement (Escalade) (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Service and Repair/Repeater Lamp

Replacement (Escalade))

* Front Side Marker Lamp Replacement (Yukon) (See: Lighting and Horns/Marker Lamp/Service and Repair/Front Side Marker Lamp

Replacement (Yukon))Front Side Marker Lamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Marker Lamp/Service and

Repair/Front Side Marker Lamp Replacement (Tahoe, Avalanche))

* Parking and Turn Signal Lamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Parking Lamp/Service and Repair/Parking and

Turn Signal Lamp Replacement (Tahoe, Avalanche))Parking and Turn Signal Lamp Replacement (Yukon) (See: Lighting and

Horns/Parking Lamp/Service and Repair/Parking and Turn Signal Lamp Replacement (Yukon))

* Tail Lamp Replacement (Avalanche) (See: Lighting and Horns/Tail Lamp/Service and Repair/Tail Lamp Replacement (Avalanche))Tail

Lamp Replacement (GMC Yukon Two-Mode Hybrid) (See: Lighting and Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail

Lamp Replacement (GMC Yukon Two-Mode Hybrid))Tail Lamp Replacement (Chevrolet Tahoe Two-Mode Hybrid) (See: Lighting and

Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail Lamp Replacement (Chevrolet Tahoe Two-Mode Hybrid))Tail Lamp