B188D - Power Liftgate Control Circuit 1 Low: Notes

For a complete wiring diagram, refer to appropriate Wiring Diagram

• >>When Monitored:<< Whenever the power liftgate is power opening or closing.
• >>Set Condition:<< When the power liftgate module senses voltage less than 1.5 volts on the liftgate open driver circuit, prior to starting a power cycle, this code will set.

Possible Causes
Q88 LIFTGATE OPEN DRIVER CIRCUIT SHORT TO GROUND
Q88 LIFTGATE OPEN DRIVER CIRCUIT SHORT to Q89 LIFTGATE CLOSE DRIVER CIRCUIT
Q89 LIFTGATE CLOSE DRIVER CIRCUIT SHORT TO GROUND
POWER LIFTGATE DRIVE UNIT SHORT
POWER LIFTGATE MODULE

Test Step 1 - DTC Present

• With the scan tool, record DTCs.
• Erase DTCs.
• Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.
• If possible, operate the liftgate several times.
• With the scan tool, check for DTCs.

Does the scan tool display B188D - Power Liftgate Control Circuit 1 Low?

Yes

• Go to Test Step 2 Test Step 2 - Liftgate Open Driver Circuit Short to Ground 

No

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.
• Perform the Body Verification Test. Refer to BODY VERIFICATION TEST .