Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 5 ohms between the control circuit terminal 1 and ground.
锟斤拷 If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
3. Test for less than 5 ohms between the control circuit terminal 3 and ground.
锟斤拷 If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
4. Connect a test lamp between control circuit terminal 1 and ground.
5. Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the OPEN state.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
锟斤拷 If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
8. Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the CLOSE state.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
锟斤拷 If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
9. If all circuits test normal, test or replace the liftgate latch assembly.
Component Testing
1. Install a 20A fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 3
and ground. The liftgate latch assembly should perform the CINCH or RELEASE function.
锟斤拷 If the function does not perform as specified, replace the liftgate latch assembly.
2. Reverse the jumper wires; the liftgate latch assembly should perform the RELEASE or CINCH function.
锟斤拷 If the function does not perform as specified, replace the liftgate latch assembly.
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 LGM replacement, setup and programming
W/O HP2 With Memory
DTC B2508 or B2509 (w/o HP2 with Memory)
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) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2508 01
- Seat Heater Relay Circuit Short to Battery
DTC B2508 02
- Seat Heater Relay Circuit Short to Ground
