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 B396C 08: Liftgate Motor Mode Switch Circuit Performance -- Signal InvalidDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Liftgate Position Sensor 5 V Reference Voltage | B153E 08 | 2 | 2 | -- |
Liftgate Disable Signal | 1, 2 | 1 | 1 | -- |
Liftgate Open Signal -- Exterior Switch | B396E 02 | 1 | 1 | -- |
Liftgate Open Signal -- Shut Face Switch | B396E 02 | 1 | 1 | -- |
Object Sensors Signal | B153F 02 | B153F 05 | B153F 05 | B153F 03, B153F 07 |
Liftgate Open Signal -- Exterior Switch | B396E 02 | 1 | 1 | -- |
Open/Close Switches Signal | B396D 02 | 1, 2 | 1, 2 | -- |
Pawl Switch Signal | B153A 08 | B153A 08 | B153A 08 | B153A 08 |
Position Sensor Signal 1 | B153E 08 | B153E 08 | B153E 08 | B153E 08 |
Position Sensor Signal 2 | B153E 08 | B153E 08 | B153E 08 | B153E 08 |
Ratchet Switch Signal | B153A 08 | B153A 08 | B153A 08 | B153A 08 |
Sector Switch Signal | B153A 08 | B153A 08 | B153A 08 | B153A 08 |
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 | -- |
Liftgate Switches Low Reference | -- | B153A 08 | 1 | B153E 08 |
Position Sensor Low Reference | -- | B0153E 08 | 2 | -- |
Mode/Release Switch Ground | -- | 1 | 1 | -- |
Liftgate Control Module Ground | -- | U0230 00 | 2 | -- |
1. Liftgate Switch Malfunction 2. Liftgate Malfunction | ||||
Circuit/System Description
When the power liftgate mode select switch is set to the Enable position, the power liftgate shall operate normally to the full height gate position. When the power liftgate mode select switch is set to the Garage Height position, the power liftgate shall operate normally to the garage height gate position. When the power liftgate mode select switch is set to the Disable position, the following power liftgate features shall be disabled:
| • | Key fob actuated power liftgate - Open & Close |
| • | Power liftgate handle operation - when the power liftgate disable switch is in the Disable position and the handle is actuated, the latch shall release to allow for manual gate operation |
| • | Driver accessible power liftgate actuation - open & close |
| • | Shut face - Power operation |
Conditions for Running the DTC
The system voltage is 9.5-16 volts.
Conditions for Setting the DTC
The liftgate control module detects an out of range condition in the mode switch circuits.
Action Taken When the DTC Sets
The liftgate will default to manual operation.
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
Note: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power 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
Connector End View Reference
Description and Operation
Rear Hatch/Gate Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the scan tool Door/Liftgate Locked Switch parameter while pressing and depressing the Liftgate Enable/Disable button on the mode/release select switch. The parameter should change from Inactive to Active.
- Observe the scan tool Liftgate Front Control Switch parameter while pressing and releasing the liftgate button on the interior liftgate control switch. The parameter should change from Inactive and Active.
- Close the liftgate by pressing the liftgate button switch. The liftgate should power close, cinch-in, and latch.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the S58B Rear Compartment Lid Release Switch - Interior.
- Test for less than 1 Ω between the ground circuit terminal 1 and ground.
- Ignition ON, verify the scan tool Door/Liftgate Locked Switch parameter is Inactive.
- Verify the scan tool Liftgate Front Control Switch parameter is Inactive.
- Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Door/Liftgate Locked Switch parameter is Active.
- Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Liftgate Front Control Switch parameter is Active.
- If all circuits test normal, test or replace the S58B Rear Compartment Lid Release Switch - Interior.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 3 for a short to ground. |
| ⇒ | If not the specified value, test the signal circuit terminal 4 for a short to ground. |
| ⇒ | 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. |
| ⇒ | 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. |
Component Testing
Mode/Release Select Switch Assembly
- Ignition OFF, disconnect the harness connector at the S58B Rear Compartment Lid Release Switch - Interior.
- Test for infinite resistance between the signal terminal 4 and the ground terminal 1 with the liftgate open switch in the inactive position.
- Test for infinite resistance between the signal terminal 3 and the ground terminal 1 with the liftgate disable switch in the inactive position.
- Test for less than 3 Ω between the signal terminal 4 and the ground terminal 1 with the liftgate open switch in the active position.
- Test for less than 3 Ω between the signal terminal 3 and the ground terminal 3 with the switch in the disable position.
| ⇒ | If not the specified value, replace the S58B Rear Compartment Lid Release Switch - Interior. |
| ⇒ | If not the specified value, replace the S58B Rear Compartment Lid Release Switch - Interior. |
| ⇒ | If greater than the specified range, replace the S58B Rear Compartment Lid Release Switch - Interior. |
| ⇒ | If greater than the specified range, replace the S58B Rear Compartment Lid Release Switch - Interior. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for liftgate control module replacement, setup, and programming |
