Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA2003MDX TOURINGREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSCRUISE CONTROL INPUT TEST
2003 Acura MDX Touring
Cruise Control Input Test
2003 Acura MDX TouringSECTION 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 ON (II).
- 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.CRUISE CONTROL INPUT TEST
Signal to be tested Test condition Parameter: Desired result Possible cause if result is not obtained Cruise control main switch signal Cruise control main switch ON and OFF CRUISE CONTROL MAIN SW should indicated ON when the cruise control main switch is turned on and OFF when the cruise control main switch is turned off. - Faulty cruise control main switch
- An open in the wire between the gauge assembly and the cruise control main switch
- A wire shorted to ground between the gauge assembly and the cruise control main switch
- An open in the wire between the cruise control main switch and the ground
Brake switch signal Cruise control main switch ON, brake pedal pressed, then released CRUISE BRAKE SW should indicate OFF when the brake pedal is pressed and ON should be indicated when the brake pedal is released. - Faulty brake pedal position switch
- Blown No. 9 (10 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
Set switch signal Set/decel switch pressed and released CRUISE CONTROL SET SW should indicate ON when the set /decel switch is pressed and OFF when the set/decel switch is released. - Faulty cruise control set/decel, resume/accel, cancel switch
- An open in the wire between the PCM and the cruise control set/decel, resume/accel, cancel switch
- A wire shorted to ground between the PCM and the cruise control set/decel, resume/accel, cancel switch
Resume switch signal Resume/accel switch pressed and released CRUISE CONTROL RESUME SW should indicate ON when the resume switch is pressed and OFF when the resume switch is released. - Faulty cruise control set/decel, resume/accel, cancel switch
- An open in the wire between the PCM and the cruise control set/decel, resume/accel, cancel switch
- A wire shorted to ground between the PCM and the cruise control set/decel, resume/accel, cancel switch
Cancel switch signal Cancel switch pressed and released CRUISE CONTROL CANCEL SW should indicate ON when the cancel switch is pressed and OFF when the cancel switch is released. - Faulty cruise control set/decel, resume/accel, cancel switch
Cruise control indicator signal Start the engine, turn the cruise control main switch on, and drive the vehicle to speeds over 25 mph (40km/h). Set and cancel the cruise control CRUISE INDICATOR should indicate ON when the cruise control is set and OFF when the cruise control is cancelled. - Faulty gauge assembly
- A burnt cruise control indicator bulb
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.