HD12 Checking Wiring Harness

^ The air suspension control module can not activate the left rear air spring solenoid valve. In order to determine the cause of this the following actions are required:

^ Electrically disconnect air spring solenoid from vehicle harness connector.

^ Using a voltmeter, connect positive lead to air spring solenoid valve wiring harness connector Circuit 429 and negative lead to Circuit 430F of the same connector.

NOTE: The Air Spring Solenoid Valve Toggle functional test is still being conducted. During this functional test the front ride height of the vehicle may lower and the rear ride height may raise.

^ Does voltage reading pulse between zero and battery voltage (check is to be made over a one minute time period)?

YES -- INSTALL a new left rear air spring solenoid and then REPEAT Service Bay Diagnostics

NO -- GO to HD13.