Scheme 1
Symptom Troubleshooting Index
| Symptom | Diagnostic procedure | Also check for |
|---|---|---|
| Cruise control cannot be set | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Check the No. 3 (15 A) fuse in the under-dash fuse/relay box. Do the CRUISE CONTROL INPUT TEST . Do the CRUISE CONTROL COMBINATION SWITCH TEST . | |
| Cruise control can be set, but the cruise main indicator does not come on | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the gauge control module self-diagnostic function procedure (see SELF-DIAGNOSTIC FUNCTION ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control main switch signal input. | Faulty gauge control module |
| Cruise control can be set, but the cruise control indicator does not come on | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control indicator signal input. | Faulty gauge control module |
| Vehicle does not decelerate or accelerate accordingly when the set/decel or resume/accel switch is pressed | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control set/decel, resume/accel switch signal input. Do the CRUISE CONTROL COMBINATION SWITCH TEST . | Open circuit, loose or disconnected terminals: GRY or LT BLU |
| Set speed does not cancel when the brake pedal is pressed | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the CRUISE CONTROL INPUT TEST . Test the brake pedal position switch signal input. Do the brake pedal position switch test (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ). | Short to power on the BRN wire Faulty brake pedal position switch |
| Set speed does not cancel when the cruise control main switch is pressed | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control main switch signal input. Do the CRUISE CONTROL COMBINATION SWITCH TEST . | Short to power on the LT GRN wire |
| Set speed does not cancel when the cancel switch is pressed | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control cancel switch signal input. Do the CRUISE CONTROL COMBINATION SWITCH TEST . | Open circuit, loose or disconnected terminals: GRY or LT BLU |
| Set speed will not resume when the resume/accel switch is pressed (with the cruise control main switch turned on, and set speed temporarily canceled by pressing the brake pedal) | Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Check the brake pedal position switch adjustment (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ). Do the CRUISE CONTROL INPUT TEST . Test the cruise control resume/accel switch signal input. Test the brake pedal position switch signal input. Do the CRUISE CONTROL COMBINATION SWITCH TEST . | Faulty brake pedal position switch Open circuit, loose or disconnected terminals: LTBLU |
| With the ignition switch ON (II), and the lighting switch turned on, the cruise control combination switch illumination does not come on | Do the CRUISE CONTROL COMBINATION SWITCH TEST . |
SYMPTOM TROUBLESHOOTING INDEX
Scheme 2
- Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 under «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/rdx/i-2006-2009/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
- Turn the ignition switch ON (II).
- Make sure the HDS communicates with the vehicle and the PCM. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
- Go to PGM-FI, and check for DTCs.
- 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.
| Signal to be tested | Test condition | Parameter: Desired result | Possible cause if result is not obtained |
|---|---|---|---|
| Brake 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. 3 (15 A) fuse in the under-dash fuse/relay box An open in the wire between the powertrain control module (PCM) and the brake pedal position switch A wire shorted to ground between the PCM and the brake pedal position switch |
| Transmission range switch signal | Shift lever in D and S | SHIFT/CLUTCH SW should indicate OFF in P, R and N and ON in D and S. | 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 CONTROL MAIN 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 |
| 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 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 switch pressed and released | CRUISE CONTROL 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 CONTROL 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). 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 |
CRUISE CONTROL INPUT TEST DESCRIPTION CHART
SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ), in the SRS before doing repairs or service.
Scheme 3
Scheme 4
- Remove the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/rdx/i-2006-2009/remont/airbag/#srs-supplemental-restraint-system) ).
- Remove the steering wheel trim (see «STEERING WHEEL REMOVAL»(/acura/rdx/i-2006-2009/remont/manual-power-steering/#power-steering-system__steering-wheel-removal) ).
- Remove the cruise control combination switch.
- Check for continuity between the terminals in each switch position according to the table. If there is continuity, and it matches the table, but switch failure occurred on the cruise control input test, check and repair the wire harness on the switch circuit. If there is no continuity in one or more positions, replace the switch.
- Check for continuity between terminals No. 1, No. 2, and No. 3 on the switch. There should be continuity. If a failure occurs between terminals No. 1, No. 2, and No. 3, replace the cruise control combination switch.
- Check for continuity between terminals No. 4 and No. 10 on the switch. There should be continuity. If a failure occurs between terminals No. 4 and No. 10, replace the cruise control combination switch.
- Check for continuity between the terminals in according to the table. If there is continuity, and it matches the table, check and repair the wire harness on the switch circuit. If there is no continuity in one or more positions, replace the switch.
