B196A
B196A-POWER LIFTGATE CLOSE DIRECTION OVERCURRENTB196A - Power Liftgate Close Direction Overcurrent:
WHEN MONITORED
Anytime the Power Liftgate is in a power closing operation.
SET CONDITION
The drive motor stall current of over 20 amps has been detected for over 500 ms. during a power closing operation.
POSSIBLE CAUSES
- Binding liftgate
- (Z918) Ground circuit open
- (Q85) Liftgate latch release driver circuit short to (Z918) ground
- (Q89) Liftgate close driver circuit short to (Z918) ground
- (Q201) Liftgate clutch driver circuit short to ground
- Power liftgate module
- Power liftgate drive unit
Diagnostic Test
1. DTC PRESENT
With the scan tool, record and erase DTC's.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
Operate the power liftgate several times if possible.
With the scan tool, read DTCs.
Q: Does the scan tool display B196A-POWER LIFTGATE CLOSE DIRECTION OVERCURRENT?
YES: Go To 2
NO: Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding conditions. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. BINDING LIFTGATE
Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, or loose/hard weatherstrip for wear or anything that would cause an obstruction to proper operation.
If necessary manually operate the liftgate of a known good vehicle and notice the effort needed. Compare the effort needed on the disabled vehicle.
Q: Were there any mechanical problems found?
YES: Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3
3. (Z918) GROUND CIRCUIT OPEN
Turn the ignition off.
Turn all lights off.
Disconnect the Power Liftgate Drive Unit connector.
Measure the resistance of the (Z918) Ground circuit to ground.
Wiggle the harness and check for an intermittent open condition.
Q: Is the resistance below 2.0 ohms?
YES: Go To 4
NO: Repair the (Z918) Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
4. (Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORT TO (Z918) GROUND
Measure the resistance between (Z918) Ground circuit and the (Q89) Liftgate Close Driver circuit.
Wiggle the harness and check for an intermittent shorted condition.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (Q89) Liftgate Close Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5
5. (Q201) LIFTGATE CLUTCH DRIVER CIRCUIT SHORT TO (Z918) GROUND
Measure the resistance between the (Z918) Ground circuit and the (Q201) Liftgate Clutch Driver circuit.
Wiggle the harness and check for an intermittent shorted condition.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (Q201) Liftgate Clutch Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 6
6. (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO (Q901) LOGIC GROUND
Disconnect the Power Liftgate Latch connector.
Measure the resistance between (Q901) Logic Ground circuit and the (Q85) Liftgate Latch Release Driver circuit.
Wiggle the harness and check for an intermittent short circuit condition.
Q: Is the resistance below 10000.0 ohms?
YES: Repair the (Q85) Liftgate Latch Release Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7
7. POWER LIFTGATE DRIVE UNIT
Reconnect all connectors at this time.
Operate the Power Liftgate in both directions if possible.
Q: Does the motor start to lift the liftgate but is very slow and labors extensively?
YES: Replace the Power Liftgate Drive Unit assembly. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Power Liftgate Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test