Cruise Control Input Test

NOTE: Always make sure that you have the latest HDS software.

Connect the HDS to the 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 ECM/PCM. If it does not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
Go to , and check for DTCs.
Do the following tests while monitoring parameters in the PGM-FI DATA LIST with the HDS.
If the input tests prove OK, replace the ECM/PCM (see ECM/PCM REPLACEMENT ).
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.

CRUISE CONTROL INPUT TEST REFERENCE CHART

Signal to be tested	Test condition	Parameter: Desired result	Possible cause if result is not obtained
Cruise brake switch signal (M/T model)	Brake pedal pressed, then released	CRUISE BRAKE SW/IDLE STOP SW should indicate OPEN when the brake pedal is pressed and CLOSE when the brake pedal is released.	Faulty brake pedal position switch Blown No. B12 (10 A) fuse in the under-dash fuse/relay box An open in the wire between the ECM and the brake pedal position switch A wire shorted to ground between the ECM and the brake pedal position switch
Idle stop switch signal (CVT model)	Brake pedal pressed, then released	CRUISE BRAKE SW/IDLE STOP SW should indicate OPEN when the brake pedal is pressed and CLOSE when the brake pedal is released.	Faulty idle stop switch Blown No. B12 (10 A) fuse in the under-dash fuse/relay box An open in the wire between the PCM and the idle stop switch A wire shorted to ground between the PCM and the idle stop switch
Clutch pedal position switch B signal (M/T model)	Clutch pedal pressed, then released	SHIFT/CLUTCH SW should indicate OFF when the clutch pedal is pressed and ON when the clutch pedal is released.	Faulty clutch pedal position switch B An open in the wire between the ECM and the clutch pedal position switch B A wire shorted to ground between the ECM and the clutch pedal position switch B Poor ground at G403
Transmission range switch signal (CVT model)	Shift lever in D	SHIFT/CLUTCH SW should indicate OFF in P and N and ON in D.	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 at G101
Cruise control main switch signal	Cruise control main button ON and OFF	CRUISE MASTER (MAIN) SW should indicate ON when the cruise control main button is pressed and OFF when the cruise control main button 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 An open in the wire between the cruise control combination switch and ground G502, T10
Set switch signal	Decel/set button pressed and released	CRUISE SET SW should indicate ON when the decel/set button is pressed and OFF when the decel/set button 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
Resume switch signal	Resume/accel button pressed and released	CRUISE RESUME SW should indicate ON when the resume/accel button is pressed and OFF when the resume/accel button 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 button pressed and released	CRUISE CANCEL SW should indicate ON when the cancel button is pressed and OFF when the cancel button 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
Cruise control indicator signal	Start the engine, press the cruise control main button on, and drive the vehicle above 25 mph (40 km/h), with 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 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