Cruise Control Input Test

Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on GENERAL TROUBLESHOOTING INFORMATION ).
Turn the ignition switch to ON (II).
Make sure the HDS communicates with the vehicle and the powertrain control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
Do the gauge control module communication line check procedure:
- With multi-information display (see WITH MULTI-INFORMATION DISPLAY ).
- With normal display (see WITH NORMAL DISPLAY ).
Go to B-CAN System Diagnosis Test Mode A, and check for DTCs.
Go to PGM-FI, and check for DTCs (see HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
Do the following tests while monitoring parameters in the PGM-FI DATA LIST with the HDS.

NOTE:

Intermittent failures are often caused by loose circuit connections. While monitoring cruise control inputs, flex their circuits, and note if any of the test results change.
On vehicles with drive by wire, the PCM handles the cruise control functions. You can use the HDS (PGM-FI snap shot) to record problem with the cruise control while driving.

DIAGNOSIS PROCEDURE

Signal to be tested	Test condition	Parameter: Desired result	Possible cause if result is not obtained
Brake pedal position switch signal	Brake pedal pressed, then released	CRUISE BRAKE SW should indicate OFF when the brake pedal is pressed and ON when the brake pedal is released.	Faulty brake pedal position switch Blown No. 18 (15 A) fuse in the driver's under-dash fuse/relay box An open in the wire between the PCM and the brake pedal position switch A wire shorted to ground between the PCM and the brake pedal position switch After market brake light bulbs that can cause false inputs
Transmission range switch signal	Shift in D or 2 position	SHIFT/TRANS RANGE SW should indicate OFF in P, R, and N and ON in D and 2.	Faulty transmission range switch An open in the wire between the PCM and the transmission range switch A wire shorted to ground between the PCM and the transmission range switch Poor ground G101
Cruise control main switch signal	Cruise control main switch ON and OFF	CRUISE MASTER SW should indicate ON when the cruise control main switch is turned ON and OFF when the cruise control main switch is turned OFF.	Faulty cruise control combination switch An open in the wire between the gauge control module and the cruise control combination switch A wire shorted to ground between the gauge control module and the cruise control combination switch An open in the wire between the cruise control combination switch and ground
Set switch signal	Set/decel switch pressed and released	CRUISE SET SW should indicate ON when the set/decel switch is pressed and OFF when the set/decel switch is released.	Faulty cruise control combination switch An open in the wire between the gauge control module and the cruise control combination switch A wire shorted to ground between the gauge control module and the cruise control combination switch
VSS (vehicle speed sensor)	Drive the vehicle at a constant speed and check VSS signal with the speedometer	The VSS signal should be the same as the speedometer	Check for an open in the countershaft speed sensor circuit
Resume switch signal	Resume/accel switch pressed and released	CRUISE RESUME SW should indicate ON when the resume/accel switch is pressed and OFF when the resume/ accel switch is released.	Faulty cruise control combination switch An open in the wire between the gauge control module and the cruise control combination switch A wire shorted to ground between the gauge control module and the cruise control combination switch
Cancel switch signal	Cancel switch pressed and released	CRUISE CANCEL SW should indicate ON when the cancel switch is pressed and OFF when the cancel switch is released.	Faulty cruise control combination switch
Cruise control indicator signal	Start the engine, turn the cruise control main switch on and drive the vehicle above 25 mph (40 km/h) with the cruise control set and cancel the cruise control	CRUISE INDICATOR should indicate ON when the cruise control is set and OFF when the cruise control is canceled.	Faulty gauge control module