GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • 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

DTC B153B 05: Liftgate Open Switch Signal Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Liftgate Module B+

B396A 02, B153A 08

B396A 02, B153A 08

--

--

Liftgate Position Sensor 5V Reference Voltage

2

B153E 08

2

--

Full Open Signal

B153B 02

B153B 05

2

--

Liftgate Disable Signal

1, 2

1

1

--

Liftgate Open Signal

1

1

1

--

Object Sensors Signal

B153F 05

B153F 05

B153F 07

--

Open/Close Switches Signal

B2494 02

1, 2

1, 2

--

Pawl Switch Signal

B153A 00

B153A 00

B153A 00

B153A 08

Position Sensor Signal 1

B153E 02

B153E 05, B153E 08

B153E 05

--

Position Sensor Signal 2

B153E 02

B153E 05, B153E 08

B153E 05

--

Ratchet Switch Signal

B153A 00

B153A 00

B153A 00

B153A 08

Sector Switch Signal

B153A 00

B153A 00

B153A 00

B153A 08

Disengage Clutch Control

B396B 02

B396B 04

B396B 01

--

Engage Clutch Control

B396B 02

B396B 04

B396B 01

--

Liftgate Latch Cinch Control

B2495 02

B2495 04

B2495 01

--

Liftgate Latch Release Control

B2495 02

B2495 04

B2495 01

--

Liftgate Motor Close Control

B396A 02

B396A 04

B396A 01

--

Liftgate Motor Open Control

B396A 02

B396A 04

B396A 01

--

Full Open Low Reference

--

2

2

--

Liftgate Switches Low Reference

--

1

1

--

Position Sensor Low Reference

--

B0153E 08

2

--

I/P Switch Ground

--

1

1

--

Liftgate Control Module Ground

--

2

2

--

1. Liftgate Switch Malfunction

2. Liftgate Malfunction

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 9-16 volts.
    • Power open or close operation is attempted.

Conditions for Setting the DTC

B153B 02

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

B153B 05

The LGM detects an open/high resistance in the full open switch signal circuit.

Action Taken When the DTC Sets

The power liftgate will not power close.

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.

Reference Information

Schematic Reference

Liftgate Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Liftgate Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool LGM Full Open Switch while opening and closing the liftgate. The parameter should change between Active and Inactive.

Circuit/System Testing

  1. Ignition OFF, disconnect the X3 harness connector at the LGM.
  2. Ignition ON, verify the scan tool LGM Full Open Switch parameter is Inactive.
  3. If not the specified value, replace the LGM.
  4. Liftgate OPEN, test for less than 1 ohm between the signal circuit terminal 5 and the ground circuit terminal 6.
  5. If greater than the specified range, replace the liftgate motor assembly.
  6. Liftgate CLOSED, test for infinite resistance between the signal circuit terminal 5 and the ground circuit terminal 6.
  7. If less than the specified value, replace the liftgate motor assembly.
  8. If all circuits test normal, replace the LGM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for LGM replacement, setup and programming