B1383
DTC B1382, B1383, or B1384
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 Descriptors
DTC B1382
- Device Ignition Accessory ON and ACC Circuit Low
DTC B1383
- Device Ignition Accessory ON and ACC Circuit High
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the ignition inputs Ignition Off/Run/Crank, Ignition 1 Run/Crank and the Ignition Accessory signals supplied from the ignition switch. The BCM uses the sequence that the signals appear, their voltage levels and the engine run flag (ERF) status to determine the power mode. Battery voltage is supplied to the ignition switch by a fuse in the underhood fuse block. The accessory voltage circuit supplies voltage to the PCM and is a pass through circuit in the BCM.
Conditions for Running the DTC
Battery voltage is 9-16 volts.
Conditions for Setting the DTC
B1382
The BCM detects that the accessory voltage circuit is open or shorted to ground for at least 1 second.
B1383
The BCM detects that the accessory voltage circuit is shorted to voltage for at least 10 seconds.
Action Taken when the DTC Sets
* The BCM stores DTC B1382 or B1383 in memory.
* The BCM determines a fail-safe power mode dependent on the last valid power mode detected and the state of the ERF.
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)
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, observe the Ignition Accessory parameter and compare the parameter to the Correct Ignition Switch Inputs table with the corresponding ignition key position. The Correct Ignition Switch Inputs table illustrates the correct state of these input parameters (circuits) in correspondence to the ignition switch position.
Circuit/System Testing
1. Inspect for an open Batt Ign Switch fuse. The fuse should be OK.
• If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* Battery positive voltage of the ignition switch
* Accessory voltage (ignition switch output)
* Run/Crank voltage (ignition switch output)
* Accessory voltage (BCM output)
* Run/Crank voltage (BCM output)
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between ground and the 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. Perform the ignition switch component test. The test should pass.
• If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X2 harness connector at the BCM. Connect the harness connector at the ignition switch.
6. Ignition in OFF and in the START positions, verify that a test lamp does not illuminate between ground and the accessory voltage circuit terminal B7.
• If the test lamp illuminates, test the voltage circuit for a short to voltage.
7. Ignition OFF, disconnect the harness connector at the ignition switch. Test for less than 1.0 ohm on the accessory voltage circuit between BCM connector terminal B7 and ignition switch connector terminal 1.
• If greater than the specified range, test the circuit for open/high resistance.
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 (Verification Tests) after completing the repair.
* Control Module References (Programming and Relearning)for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (Service and Repair)