2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1250

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1250

7. Connect a DMM between the control circuit terminal 4 and ground.

8. Command the battery vent fan to 60 percent with a scan tool. Test for less than 1 V after a 10 second delay.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the drive motor

generator battery control module.

9. Command the battery vent fan to 0 percent with a scan tool. Switch the DMM to the diode test. The DMM reading should display O.L.

瀚慖f less than the specified value, test the control circuit for a short to ground. If the circuits test normal, replace the drive motor generator

battery control module.

10. Command the battery vent fan to 60 percent with a scan tool. The reading should be less than 3 V.

瀚慖f less than the specified range or displaying O.L., test the control circuit for an open/high resistance. If the circuits test normal, replace

the drive motor generator battery control module.

Generator Battery Vent Fan Relay Test

1. Disconnect the harness connector at the battery vent fan relay.

2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 4 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 3 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 4 for a short to ground. If the circuit tests normal, replace the battery vent fan

relay.

4. Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

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

5. Connect a 15 A fused jumper wire between the B+ circuit terminal 3 and the control circuit terminal 4. Verify the generator battery vent fan

is activated.

瀚慖f the cooling fan does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the

generator battery vent fan.

6. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.

7. Command the battery pack vent fan speed between 0 and 60 percent with a scan tool. The test lamp should turn ON and OFF after a 10

second delay.

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 drive motor generator

battery control module.

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 drive motor generator battery control module.

8. If all circuits test normal, test or replace the generator battery vent fan relay.

Component Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal

Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must

be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.