Module Check
Ensure ignition is off. Locate diagnostic connector near brake booster. Connect voltmeter leads to circuit No. 606 and ground. Start engine. Observe voltage readings. If voltage is 11-14 volts, proceed to QUICK TEST A2 . If voltage is more than 14 volts, correct overvoltage condition and proceed to QUICK TEST A2 . If no voltage exists, proceed to QUICK TEST A3 .