P16B7

DTC P16B7

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 Descriptor
DTC P16B7 00
- Electric A/C Compressor Control Module Wake-Up Circuit Performance

Diagnostic Fault Information






Circuit/System Description

The accessory wake up serial data 2 circuit is energized by the hybrid powertrain control module 2 to immediately activate the A/C compressor connected to this circuit when the body control module (BCM) signals the hybrid powertrain control module 2 that serial data is required.

Conditions for Running the DTC

* The system voltage is greater than 10.25 V.
* The A/C compressor is awake.
* Vehicle ON.
* The A/C compressor receives serial data message from hybrid powertrain control module 2 and "Propulsion System Active" is TRUE for 500 ms continuously.

Conditions for Setting the DTC

The A/C compressor detects a fault in the wake up circuit.

Action Taken When the DTC Sets

DTC P16B7 is a type B DTC.

Conditions for Clearing the DTC

DTC P16B7 is a type B DTC.

Diagnostic Aids

Short to ground may set multiple no communication codes for high speed GMLAN control modules.

Reference Information
Schematic Reference

* Data Communication Schematics [1][2]Electrical Diagrams
* Control Module References Programming and Relearning

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Data Link Communications Description and Operation Description and Operation
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

Verify that DTC P06E4 is not set.

If the DTC is set, refer to DTC P06E4 P06E4.

Circuit/System Testing

Note: Use the schematic to identify the control modules B+, ignition, ground, communication enable and serial data circuit terminals.

1. Vehicle OFF, disconnect the X1 harness connector at the G1 A/C compressor.
2. Vehicle in Service Mode, verify that a test lamp illuminates between the wake up circuit terminal 2 X1 and ground.

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

3. Vehicle OFF, verify that a test lamp does not illuminate between the wake up circuit terminal 2 X1 and ground.

• If the test lamp illuminates, test the circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. If all circuits test normal, replace the G1 A/C compressor.

Repair Instructions

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

Control Module References Programming and Relearning for control module replacement, programming and setup