2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 448

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 448

2. Disconnect the harness connector at the ignition switch.

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

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

Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.

4. Perform the ignition switch component test. The test should pass.

瀚慖f the ignition switch fails, replace the ignition switch.

5. Ignition OFF, disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the

BCM and ground.

* Ignition key resistor signal terminal 4

* Off/Run/Crank voltage terminal 2

* Accessory voltage terminal 21

* Ignition 1 voltage terminal 14

瀚慖f greater than specified, test the circuit for a short to voltage.

6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.

* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6

* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5

* Accessory voltage, BCM terminal 21 and ignition switch terminal 3

* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2

瀚慖f greater than 1 ohm, repair the circuit for open/high resistance

7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.

瀚慖f less than specified, repair the signal circuit for a short to ground.

8. If all circuits test normal, replace the BCM.

Component Testing

Ignition Switch

1. Ignition OFF, disconnect the harness connector at the ignition switch.

2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.

If any reading is not as specified, replace the ignition switch.

Repair Instructions

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

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition

Switch/Service and Repair)

B1441

DTC B1441

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System