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Home >> Chevy Truck >> 2011 >> Traverse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B153A

B153A




DTC B153A

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 Descriptors
DTC B153A 00
- Liftgate Latch Switch Signal Circuit

DTC B153A 08
- Liftgate Latch Switch Signal Circuit Signal Invalid

Diagnostic Fault Information





Circuit/System Description

The ratchet, pawl, and sector switches are part of the liftgate latch assembly and are used by the liftgate control module to determine the state of the latch during the process of cinching or unlatching. The ratchet and pawl switches will be inactive when the primary and secondary latches are latched, and the sector switch will be active during the power cinch function. Each of the latch switch signal circuits are supplied signal through a resistor and monitored within the liftgate control module. The latch switches share a common low reference circuit from the liftgate control module and when the switch contacts close the signal circuit goes low and the liftgate control module determines the switch to be active.

Conditions for Running the DTC

When the liftgate latch is being commanded to release.

Conditions for Setting the DTC

B153A 00

When the liftgate control module detects an open/high resistance in the ratchet, pawl, and/or the sector signal circuit, an open/high resistance in the liftgate latch low reference circuit, or any incorrect combination of signals from the following switch inputs:

* Ratchet switch
* Pawl switch
* Sector switch

B153A 08

When the liftgate control module detects a loss of B+ voltage, an open/high resistance in the sensor signal circuit, an open/high resistance in the liftgate latch low reference circuit, or any incorrect combination of signals from the following switch inputs:

* Ratchet switch
* Pawl switch
* Sector switch

Action Taken When the DTC Sets

* The liftgate may not power open or power close.
* The latch may be inoperative or not function normally.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

DTC B153A may be set when the vehicle is driven while the liftgate is open, as when the owner transports a large package in the rear of the vehicle. The DTC will become history after the liftgate is closed and does not affect normal liftgate operation.

Note: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (Procedures) for the appropriate procedure.

Whenever the liftgate control module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate control module.

Reference Information
Schematic Reference

Liftgate Schematics (Liftgate Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Rear Hatch/Gate Description and Operation (Rear Hatch/Gate)
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. With the liftgate closed, observe the scan tool LGM Latch Pawl, Ratchet, and Sector Switch parameters. Each parameter status should be as listed below:

* LGM Latch Pawl Sw. parameter - Inactive
* LGM Latch Ratchet Sw. parameter - Inactive
* LGM Latch Sector Sw. parameter - Inactive

2. With the liftgate open, observe the scan tool LGM Latch Pawl, Ratchet, and Sector Switch parameters. Each parameter status should be as listed below:

* LGM Latch Pawl Sw. parameter - Active
* LGM Latch Ratchet Sw. parameter - Active
* LGM Latch Sector Sw. parameter - Inactive

3. Sector Switch Test - Close the liftgate allowing the cinch motor to pull the liftgate closed. Observing the scan tool LGM Latch Sector Sw parameter while the liftgate is being automatically cinched closed; the parameter should change from Inactive to Active then back to Inactive within 10 seconds.

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the K39 liftgate control module.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the K39 liftgate control module.

3. Ignition OFF, connect the X2 harness connector at the K39 liftgate control module.
4. Ignition OFF, disconnect the harness connector at the A23C liftgate latch assembly.
5. Test for less than 10 ohm between the low reference circuit terminal 2 and ground.

• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.

6. Ignition ON, verify the scan tool LGM Latch Pawl Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.

7. Install a 3A fused jumper wire between the signal circuit terminal 5 and low reference circuit terminal 2. Verify the scan tool LGM Latch Pawl Sw. parameter is Active.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.

8. Verify the scan tool LGM Latch Ratchet Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.

9. Install a 3A fused jumper wire between the signal circuit terminal 6 and low reference circuit terminal 2. Verify the scan tool LGM Latch Ratchet Sw. parameter is Active.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.

10. Verify the scan tool LGM Latch Sector Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.

11. Install a 3A fused jumper wire between the signal circuit terminal 4 and low reference circuit terminal 2. Verify the scan tool LGM Latch Sector Sw. parameter is Active.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.

12. If all circuits test normal, test or replace the A23C liftgate latch assembly.

Repair Instructions

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

* Liftgate Latch Replacement (Service and Repair)
* Liftgate Calibration (Programming and Relearning)
* Control Module References (Programming and Relearning)for liftgate control module replacement, setup and programming

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