P1A5F

DTC P1A5E or P1A5F

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 Instructionsprovides an overview of each diagnostic category.

DTC Descriptors
DTC P1A5E 00
- Ignition RUN/Crank Switch Circuit Low Voltage

DTC P1A5F 00
- Ignition RUN/Crank Switch Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The hybrid powertrain control module 2 (HPCM2) sends the RUN/Crank power mode status in a serial data message to the battery energy control module (BECM). The body control module powers up the RUN/Crank circuit to the hybrid control powertrain control module 2 and the battery energy control module when the vehicle is in the RUN/Crank power mode.

Conditions for Running the DTC

P1A5F 00
* Vehicle power mode is OFF
* BECM is awake
* System voltage greater than 9 V

P1A5E 00
* Vehicle power mode is not in RUN
* BECM is awake
* System voltage greater than 9 V

Conditions for Setting the DTC

P1A5F 00

RUN/Crank input is not active and not below 5 V.

P1A5E 00

RUN/Crank input is active and not above 5 V.

Action Taken When the DTC Sets

DTC's P1A5E and P1A5F are type B DTC's.

Conditions for Clearing the DTC

DTC's P1A5E and P1A5F are type B DTC's.

Diagnostic Aids

* A short to voltage in the RUN/Crank control circuit will keep the vehicle bus awake, which can drain the vehicle's battery.
* A short to ground in the extension of this circuit through the body control module can back feed to the keyless entry control module. Check for a short to ground on the RUN/Crank circuit on the other side of the RUN/Crank pass thru, in the body control module, before replacing the body control module.

Reference Information
Schematic Reference

* Body Control System Schematics [1][2]Body Control Systems
* Power Distribution Schematics Power Distribution Schematics

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
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 Control Module Referencesfor scan tool information

Circuit/System Testing

1. Verify DTC B144B is not set.

• If the DTC is set, refer to DTC B144B B144B.

2. Disconnect the X2 harness connector at the A4 hybrid battery pack.
3. Ignition OFF, test for B+ between the ignition circuit terminal 4 and ground.

• If B+ appears, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 4 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

5. If all circuits test normal, replace the K16 battery energy control module.

Repair Instructions

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

Control Module References Control Module Referencesfor the appropriate control module replacement, programming and setup