2010 Cadillac CTS Sedan AWD V6-3.6L Page 363
* Ignition terminal 4
* Ignition terminal 21
* Ignition terminal 21, X4
瀚慖f greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 Ohms between the BCM and the ignition switch on the circuits listed below:
* Ignition terminal 2, X1 and ignition switch terminal 4
* Ignition terminal 21, X1 and ignition switch terminal 3
* Ignition terminal 21, X4 and ignition switch terminal 1
瀚慖f greater than specified, test the circuit for open/high resistance
7. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Verify the resistance between the terminals listed below match for each ignition switch position.
瀚慖f not the specified value, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair/Ignition and Start Switch Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B1380
DTC B1370-B1379, B1380-B1389, or B1440-B1443
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1370 01
- Device Ignition 1 (ON and START) Circuit Short to Battery
DTC B1370 06
- Device Ignition 1 (ON and START) Circuit Short to Ground or Open
DTC B1380 01
- Device Ignition ACCESSORY Circuit Short to Battery
DTC B1380 06
- Device Ignition ACCESSORY Circuit Short to Ground or Open
