B1380

DTC B1370-B1379, B1380-B1389, or B1440-B1443

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC B1370 01
- Device Ignition 1 Circuit Short to Ground

DTC B1370 06
- Device Ignition 1 Circuit Short to Battery or Open

DTC B1380 01
- Device Ignition ACCESSORY Circuit Short to Battery

DTC B1380 02
- Device Ignition ACCESSORY Circuit Short to Ground

DTC B1380 04
- Device Ignition ACCESSORY Circuit Open Circuit

DTC B1441 01
- Device Ignition OFF, RUN and CRANK Circuit Short to Battery

DTC B1441 02
- Device Ignition OFF, RUN and CRANK Circuit Short to Ground

DTC B1441 06
- Device Ignition OFF, RUN and CRANK Circuit Short to Battery or Open




Diagnostic Fault Information






Conditions for Running the DTC

B1370 01

Ignition switch is in the OFF or ACC positions.

B1370 06

Ignition switch is in the START position.

B1380 01, B1380 02, B1380 04, B1441 01, B1441 02, B1441 06

The system voltage is 9-18 volts.


Conditions for Setting the DTC

B1370 01, B1380 01, B1441 01

BCM detects a short to ground for more than 2 seconds.

B1370 06, B1380 04, B1380 06, B1441 02, B1441 06

The BCM detects an open or short to voltage.


Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.



Reference Information
Schematic Reference

* Power Distribution Schematics (Power Distribution Diagrams)
* Body Control System Schematics (Electrical Diagrams)

Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Mode Description and Operation (Power Mode Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.





If any parameters are incorrect in any key position, refer to the Circuit/System Testing or Component Testing.



Circuit/System Testing


Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.


1. Inspect the Ign Switch fuse for open.

• If the fuse is open, test the circuits listed below for a short to ground:


* Ignition switch B+
* Accessory voltage
* Off/Run crank voltage
* Ignition 1 voltage


• If all circuits test normal, replace the BCM.

2. Ignition OFF, disconnect the harness connector at the ignition switch.
3. Ignition ON, verify that a test lamp illuminates between the ignition switch B+ circuit terminal 2 and ground.

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


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


4. Ignition OFF, disconnect X2 and X4 harness connectors at the BCM.
5. Ignition key out, test for less than 1-volt between the circuit terminals listed below and ground:

* Accessory voltage terminal C8
* Ignition 1 voltage terminal D3
* Off/Run/Crank voltage terminal 56


• If greater than the specified range, test the circuit for a short to voltage.

6. Test for less than 1 ohm between the BCM terminals and the ignition switch terminals listed below:

* Accessory voltage terminal C8 and 4
* Ignition 1 voltage terminal D3 and 3
* Off/Run/Crank voltage terminal 56 and 5


• If greater than the specified range, test the circuit for an open/high resistance.

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



Component Testing

Ignition Switch

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

If any reading is other than specified, replace the ignition switch.







Repair Instructions

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

* Ignition and Start Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming