Power Mode Mismatch
Power Mode Mismatch
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1370 01
- Device Ignition 1 Circuit Short to Battery
DTC B1370 04
- Device Ignition 1 Circuit Open Circuit
DTC B1380 01
- Device Ignition ACCESSORY Circuit Short to Battery
DTC B1380 04
- Device Ignition ACCESSORY Circuit Open Circuit
DTC B1441 01
- Device Ignition OFF, RUN and CRANK Circuit Short to Battery
DTC B1441 06
- Device Ignition OFF, RUN and CRANK Circuit Short to Ground or Open
Diagnostic Fault Information
Conditions for Running the DTC
B1370 01
Ignition switch is in the OFF or ACC positions.
B1370 04
Ignition switch is in the START position.
B1380 01, B1380 04, B1441 01, 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 voltage.
B1370 04, B1380 04
The BCM detects an open.
B1441 06
The BCM detects an open or short to ground.
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 Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Power Mode Description and Operation Power Mode
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
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
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect the Ignition Switch B+ fuse for an 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.
Note: 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