Cruise Control Communication Circuit Troubleshooting

Start the engine.
Turn on the cruise control main switch, then drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control.
Does the cruise control operate?
1. YES -Go to step 3.
2. NO -Check the cruise control actuator (see Cruise Control Actuator Input Test ).
Turn the ignition switch OFF.
Disconnect powertrain control module (PCM) connector A (32P) and the cruise control actuator 12P connector.
Check for continuity between PCM connector A terminal No. 5 and body ground.

Fig 1: Checking Continuity Between PCM Connector A Terminal No. 5 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES -Repair a short to ground in the wire between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.
2. NO -Go to step 6.
Check for continuity between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.

Fig 2: Checking Continuity Between PCM Connector A Terminal No. 5 & Cruise Control Actuator 12-Pin Connector Terminal No. 10
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES -Go to step 7.
2. NO -Repair an open in the wire between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.
Reconnect the PCM connector A (32P) and the cruise control actuator 12P connector.
Connect a voltmeter between PCM connector A terminal No. 5 and body ground. Test drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.

Fig 3: Connecting A Voltmeter Between PCM Connector A Terminal No. 5 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1 V?
1. YES -Check for loose connectors of the BLU/GRN wire between the cruise control actuator and the PCM. If necessary replace the PCM and recheck.
2. NO -Substitute a known-good actuator. If the system works properly, replace the cruise control actuator.