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
- Electric A/C Compressor Control Module Wake-Up Circuit Performance
For symptom byte information, refer to Symptom Byte List Symptom Byte List.
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 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 devices.
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
1. Vehicle in Service Mode.
2. Verify DTC P06E4 is not set.
• If DTC P06E4 is set
Refer to DTC P06E4 P06E4.
• If DTC P06E4 is not set
3. Refer to Circuit/System Testing.
Circuit/System Testing
Note: Use the schematics and connector end views to identify the device's accessory wake up serial data 2 circuit terminals.
1. Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 meters (9.8 feet) away from vehicle. Disconnect the X1 harness connector at the G1 A/C compressor. It may take up to 2 minutes for all vehicle systems to power down.
2. Vehicle in Service Mode.
3. Verify that a test lamp illuminates between the accessory wake up serial data 2 circuit terminal 2 X1 and ground.
• If the test lamp does not illuminate
1. Vehicle OFF, disconnect the X2 harness connector at the K114B hybrid powertrain control module 2.
2. Test for infinite resistance between the G1 A/C compressor wake up circuit terminal 2 X1 and the K114B hybrid powertrain control module 2 wake up circuit terminal 69 X2.
• If infinite resistance, repair the open/high resistance in the accessory wake up serial data 2 circuit.
• If less than infinite resistance, replace the K114B hybrid powertrain control module 2.
• If the test lamp illuminates
4. Replace the G1 A/C compressor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Programming and Relearning for device replacement, programming and setup