Cruise Control Communication Circuit Troubleshooting (A/T)

WARNING: This page is about a different car, the 2002 Honda Accord, 2001 Honda Accord, 2000 Honda Accord, 1999 Honda Accord, and 1998 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

Start the engine.
Turn on the cruise control main switch, then drive the vehicle to 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 unit (see Control Unit Input Test ) or cruise control actuator.
Turn the ignition switch OFF.
Disconnect Powertrain Control Module (PCM) connector A (32P) and cruise control unit connector.
Check for continuity between the PCM connector terminal A5 and body ground.

Fig 1: Checking Continuity Between PCM Connector Terminal A5 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair a short in the wire between the PCM connector terminal A5 and the cruise control unit connector terminal No. 8.
2. NO - Go to step 6.
Reconnect PCM connector A (32P) and cruise control unit connector.
Turn the ignition switch ON (II).
Connect a voltmeter between cruise control unit 14P connector terminal No. 8 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 2: Checking Voltage Between Cruise Control Unit 14P Connector Terminal No. 8 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
1. YES - Go to step 9.
2. NO - Replace the cruise control unit.
Connect a voltmeter between PCM connector terminal A5 and body ground. Drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.

Fig 3: Checking Voltage Between PCM Connector Terminal A5 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1 V?
1. YES - Check for loose connections of the BLU/GRN wire between the cruise control unit and the PCM. If necessary replace the PCM and recheck. (see GENERAL TROUBLESHOOTING INFORMATION ).
2. NO - Repair open in the wire between the A5 terminal and the cruise control unit connector terminal No. 8.