B153B

DTC B153B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B153B 02
- Liftgate Open Switch Signal Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

The full open switch is part of the gear motor assembly and will close and become active when the liftgate reaches the full open position. The full open switch signal circuit is supplied battery voltage through a resistor and monitored within the liftgate control module. The liftgate control module (LGM) provides a low reference circuit and when the switch contacts close, the signal circuit goes low and the LGM determines the switch to be active.

Conditions for Running the DTC

* The system voltage is 9-18 volts
* Power open or close operation is attempted

Conditions for Setting the DTC

The LGM detects a short to ground in the full open switch signal circuit.

Action Taken When the DTC Sets

The power liftgate system will be disabled.

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

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

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

Circuit/System Verification

1. Ignition ON, doors unlocked, transaxle in Park, enable the power liftgate by pressing the liftgate enable/disable button on the I/P switch assembly.
2. Open the liftgate by pressing the touchpad on the liftgate handle switch and close by pressing the liftgate button switch. The liftgate should release, power open, power close, cinch-in and latch.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the LGM.
2. Ignition ON, verify the scan tool LGM Full Open Sw. parameter is Inactive.

^ If not the specified value, replace the LGM.

3. With the liftgate OPEN, check for less than 1 ohm between signal circuit terminal 5 and ground circuit terminal 6.

^ If greater than the specified value, replace the liftgate motor assembly.

4. With the liftgate CLOSED, check for infinite resistance between signal circuit terminal 5 and ground circuit terminal 6.

^ If less than the specified value, replace the liftgate motor assembly.

5. If all circuits test normal, replace the LGM.

Repair Instructions

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

Liftgate Calibration Procedure

Liftgate Actuator Replacement