2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 240

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 240

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

Bus/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool References

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Verify DTC B101E is not set.

If the DTC is set, program the control module. If the DTC resets, replace the control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for control module replacement, setup, and programming

B127C

DTC B1277, B127C, or B127D

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC B1277 01

- Microphone 1 (LF) Input Signal Circuit Short to Battery

DTC B1277 02

- Microphone 1 (LF) Input Signal Circuit Short to Ground

DTC B1277 04

- Microphone 1 (LF) Input Signal Circuit Open

DTC B1277 1A

- Microphone 1 (LF) Input Signal Circuit Bias Level Out of Range

DTC B127C 01

- Microphone 2 (RF) Input Signal Circuit Short to Battery

DTC B127C 02

- Microphone 2 (RF) Input Signal Circuit Short to Ground

DTC B127C 04

- Microphone 2 (RF) Input Signal Circuit Open

DTC B127C 1A

- Microphone 2 (RF) Input Signal Circuit Bias Level Out of Range