|Using a voltmeter, measure the voltage between the battery terminals. Compare the voltage measured at the battery with the voltage shown in the VSA DATA LIST with the HDS.|
Is the voltage difference 3 V or more?
YES - Replce the VSA modulator-control unit.n
NO - Check the battery, and do the alternator regulator circuit troubleshooting: R18A1 engine model, K20Z2 engine model. Also check for loose terminals in the VSA modulator-control unit 37P connector. If necessary, substitute a known-good VSA modulator-control unit and retest.n