JB20 Checking Wiring Harness (Circuit 54D)

^ Disconnect left front door Courtesy Switch from vehicle wiring harness.

^ Using a voltmeter, connect positive lead to the Courtesy Switch wiring harness connector Circuit 54D and negative lead to battery ground.

^ Is voltage reading greater than 10 volts?

YES -- GO to JB21.

NO -- SERVICE open/short in battery supply voltage circuit. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes