Cruise Control System Acura Integra III

DESCRIPTION

The cruise control unit receives command signals from cruise control main switch and cruise control SET/RESUME switch. Cruise control unit receives vehicle operating information from brakelight switch, Vehicle Speed Sensor (VSS), and clutch switch (M/T) or A/T gearshift position switch (A/T). Ignition Control Module (ICM) also provides operating information to cruise control unit.

The cruise control unit compares actual vehicle speed to selected speed. Throttle is either opened or closed based upon this comparison. A signal from the brakelight switch will disengage system when brakes are applied. The clutch switch, gearshift lever position switch, and cancel switch will also send disengage signals to cruise control unit.

OPERATION

Cruise main switch is energized when ignition switch is in ON or START position. Cruise control unit is energized when cruise main switch is in ON position. Cruise control system maintains speeds greater than 25 MPH. To set, press SET switch at desired speed. Pressing main switch to off will cancel cruise control system operation and erase vehicle speed from memory.

If system is disengaged temporarily by brakelight switch, clutch switch or gearshift lever position switch, press RESUME switch. Pressing RESUME switch will automatically return vehicle to previous set speed. Pressing and holding RESUME switch will gradually increase vehicle speed without having to press accelerator pedal. When RESUME switch is released, system is reprogrammed for new speed.

For gradual deceleration without pressing brake pedal, press and hold SET switch until desired speed is reached. When desired speed is reached, release SET switch.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

ACTUATOR CABLE

1. Ensure actuator cable operates smoothly without binding or sticking. Start and warm engine to normal operating temperature. Measure actuator rod movement before cable pulls on accelerator lever (engine speed starts to increase). This is amount of cable free play. (Scheme 1) Cable free play should be 0.39-.49 (9.5-12.5 mm).
2. If free play is not as specified, loosen lock nut and turn adjusting nut as necessary. Tighten lock nut and recheck free play. Test drive vehicle and verify actual speed is within 2 MPH of set speed. If necessary, check throttle cable free play.

Scheme 1

BRAKE PEDAL HEIGHT

1. Loosen brakelight switch lock nut. Back off switch until it no longer touches brake pedal. Loosen brake pedal push rod lock nut. Screw push rod in or out until pedal height from floor is to specification. See BRAKE PEDAL SPECIFICATIONS table. Tighten lock nut.
2. Screw in brakelight switch until plunger is fully pressed (threaded end touching pad on pedal arm). Back off switch 1/4 turn and ensure 0.01" (0.3 mm) between threaded end of switch and pad on pedal arm. On all models, tighten lock nut firmly. Ensure brakelights work when brake pedal is pressed. Check brake pedal free play with engine off and pushing pedal by hand. See BRAKE PEDAL SPECIFICATIONS table.

BRAKE PEDAL SPECIFICATIONS (1)

CLUTCH PEDAL HEIGHT

1. Loosen clutch pedal switch lock nut. Back off switch until it no longer touches clutch pedal. Loosen clutch master cylinder push rod lock nut and turn push rod to obtain specified pedal height from floor. See CLUTCH PEDAL ADJUSTMENT SPECIFICATIONS table. Pedal height is measured from middle of pedal face to floor below clutch pedal. Tighten lock nut to specification. See TORQUE SPECIFICATIONS.
2. Screw in clutch pedal switch until it contacts pedal, then an additional 3/4 to one full turn. Tighten clutch switch lock nut to specification. See TORQUE SPECIFICATIONS.
3. Loosen clutch interlock switch (upper switch) lock nut. With clutch pedal fully pressed, measure clearance between middle of pedal face to floor. Release clutch pedal 0.6-0.8" (15-20 mm) from fully depressed position and hold. Adjust position of clutch interlock switch so engine will start with clutch pedal at this position. Screw switch in an additional 3/4 to one turn. Tighten lock nut to specification. See TORQUE SPECIFICATIONS.

CLUTCH PEDAL ADJUSTMENT SPECIFICATIONS

GEARSHIFT LEVER POSITION SWITCH

1. Remove front console. Gearshift lever position switch is located on right side of gearshift lever mechanism. Disconnect gearshift lever position switch Gray 14-pin connector.
2. Loosen 2 gearshift lever position switch mounting bolts. Slowly slide switch toward "P" position, to within 0.08" (2 mm), while checking for continuity between gearshift lever position switch 14-pin connector terminals No. 1 (Black wire) and No. 12 (Green/White wire). (Scheme 2)
3. If continuity does not exist, go to next step. If continuity exists, gearshift lever position switch is okay. Tighten switch mounting bolts. Verify vehicle starts with gearshift lever in "P" and "N" positions. If continuity does not exist, check gearshift lever detent and bracket for damage. If no damage exists, replace gearshift lever position switch.

Scheme 2

COMPONENT TESTS

Note. Radio/cassette or radio/CD player contain an anti-theft protection circuit. Whenever battery is disconnected or radio fuse No. 32 (7.5-amp) is removed, radio will go into anti-theft mode. When battery voltage is restored and radio is turned on, radio displays CODE and is inoperative until proper 5-digit code number is entered by vehicle owner.

ACTUATOR ASSEMBLY

1. Disconnect 4-pin connector at actuator. Actuator is located on left side of engine compartment. Ensure output linkage moves smoothly. Using a fused jumper wire, connect terminal "D" of actuator connector to battery voltage. Using another jumper wire, connect terminal "A" of actuator connector to ground. (Scheme 3)
2. Listen for clicking sound from clutch, and locked output linkage. If actuator output linkage is not locked, replace actuator. Check actuator motor operation in each output linkage position. (Scheme 3) If actuator motor operates as specified, it is operating properly. Replace actuator motor if it does not operate as specified.

Scheme 3

BRAKELIGHT SWITCH

1. Disconnect connector from brakelight switch. Check for continuity between switch terminals "A" and "D". (Scheme 4) Continuity should exist. Check for continuity between switch terminals "B" and "C". Continuity should not exist.
2. Press and hold brake pedal. Check for continuity between switch terminals "A" and "D". Continuity should not exist. Check for continuity between switch terminals "B" and "C". Continuity should exist. If switch continuity is not as specified, check brake pedal height. See BRAKE PEDAL HEIGHT under ADJUSTMENTS. If brake pedal height is okay, replace brakelight switch.

Scheme 4

CLUTCH SWITCH

Disconnect connector from clutch switch. Check for continuity between clutch switch terminals. Continuity should exist. Press and hold clutch pedal. Check for continuity between clutch switch terminals. Continuity should not exist. If switch continuity is not as specified, check clutch pedal height. See CLUTCH PEDAL HEIGHT under ADJUSTMENTS. If clutch pedal height is okay, replace clutch pedal switch.

DIMMER CONTROL CIRCUIT

Note. Instrument light dimmer control regulates brightness of cruise control indicator light.

1. Turn ignition off. Remove lower dashboard cover. From behind dashboard, push out dimmer switch from dashboard. Disconnect dimmer switch connector.
2. Check for continuity between dimmer switch connector Black wire and ground. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire or poor ground connection G201 (located at left side of engine compartment next to windshield washer fluid reservoir) or ground connection G401 (located behind left kick panel).
3. Turn headlight switch to ON position. Check for battery voltage between dimmer switch connector Red/Black wire and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 19 (10-amp), located in underdash fuse/relay box. Replace fuse if necessary. If fuse is good, replace headlight switch or repair open circuit in Red/Black wire.
4. With headlight switch in ON position, connect a jumper wire between dimmer switch connector Red wire and ground. If instrument lights illuminate, dimmer switch circuits are okay. Replace dimmer switch. If instrument lights do not illuminate, repair open in Red wire.

SET/RESUME SWITCH

Note. This test procedure also tests clockspring in steering column.

1. Disable air bag system. See «AIR BAG RESTRAINT SYSTEM»(/acura/integra/iii-1993-2001/remont/airbag/#air-bag-restraint-system) article. Remove instrument panel lower cover and knee bolster. Locate clockspring Gray 3-pin connector under steering column, next to SIR Yellow 6-pin connector. Depress SET button to ON position. Check for continuity between clockspring Gray 3-pin connector terminals No. 1 (Light Green/Red wire) and No. 2 (Blue/Green wire). If continuity exists, go to next step. If continuity does not exist, go to step 3).
2. Depress RESUME button to ON position. Check for continuity between clockspring Gray 3-pin connector terminals No. 2 (Blue/Green wire) and No. 3 (Light Green/Black). If continuity exists, switch and clockspring are okay. If continuity does not exist, go to next step.
3. Remove SET/RESUME switch from steering wheel. See SET/RESUME SWITCH under REMOVAL & INSTALLATION. With switch connector index on top, terminal No. 1 is on the left. Depress SET button to ON position. Check for continuity between switch terminals No. 1 and 3. Depress RESUME button to ON position. Check for continuity between switch terminals No. 1 and 2. If continuity exists at both switch positions, replace clockspring. See «AIR BAG RESTRAINT SYSTEM»(/acura/integra/iii-1993-2001/remont/airbag/#air-bag-restraint-system) article. If continuity does not exist, replace SET/RESUME switch.

Note. Only A/T vehicles are equipped with gearshift lever position switch.

1. Gearshift lever position switch is located on right side of gearshift lever mechanism. Remove front console. Disconnect gearshift lever position switch 14-pin connector.
2. Check for continuity between switch connector Green/White and Black wire terminals with gearshift lever in "2", "D3", and "D4" positions. Move gearshift lever back and forth at each position without touching lock button. If continuity exists within free play range of each position, gearshift lever position switch is okay. If continuity does not exist within free play range of each position, adjust switch free play and retest. See GEARSHIFT LEVER POSITION SWITCH under ADJUSTMENTS. If continuity still does not exist, replace gearshift lever position switch.

MAIN SWITCH

1. Remove main switch from instrument panel. With main switch in OFF position, check for continuity between main switch terminals "B" and "C", and between terminals "D" and "E". (Scheme 5) If continuity exists, go to next step. If continuity does not exist, replace defective bulb. After replacing bulb, repeat test. If switch continuity is not as specified, replace main switch.
2. Turn main switch to ON position. Check for continuity between main switch terminals "A" and "B", "B" and "C", and "D" and "E". If continuity exists, switch is okay. If continuity does not exist between main switch terminals "A" and "B", replace switch. If continuity does not exist between main switch terminals "B" and "C" or terminals "D" and "E", go to next step.
3. Replace defective bulb inside main switch. After replacing bulb, repeat step 2). If continuity is not as specified, replace main switch.

Scheme 5

CONTROL UNIT INPUT TEST

1. Disable air bag system. See «AIR BAG RESTRAINT SYSTEM»(/acura/integra/iii-1993-2001/remont/airbag/#air-bag-restraint-system) article. Turn ignition off. Remove instrument panel lower left cover. Remove left knee bolster. Cruise control unit is located near left kick panel.
2. Disconnect cruise control unit 14-pin connector. Ensure connector and terminals are okay. Repair as necessary and retest system. If connector and terminals are okay, use a DVOM to perform cruise control unit input tests. (Scheme 6) If an input test indicates a problem, find and correct cause and retest system. If all input test results are okay, replace cruise control unit.

Scheme 6

TROUBLE SHOOTING

PRELIMINARY CHECKS

Before trouble shooting by symptom, ensure fuses No. 15 (10-amp) and No. 24 (15-amp or 20-amp) located in underdash fuse/relay box are okay. Also check fuses No. 39 (50-amp), No. 41 (100-amp), and No. 42 (20-amp), located in underhood main fuse/relay box. Replace fuses as necessary. Ensure horn and tachometer operate properly.

Note. When diagnosing vehicle by symptom, check possible failures in the order given.

CRUISE CONTROL CANNOT BE SET

1. Test main switch. See MAIN SWITCH under COMPONENT TESTS. Test SET/RESUME switch. See SET/RESUME SWITCH under COMPONENT TESTS. Test brakelight switch and mounting. See BRAKELIGHT SWITCH under COMPONENT TESTS. Test clutch switch on M/T vehicles. See CLUTCH SWITCH under COMPONENT TESTS. Test gearshift lever position switch on A/T vehicles. See GEARSHIFT LEVER POSITION SWITCH under COMPONENT TESTS. Check cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.
2. Check ground connection G301 (located in left side of engine compartment next to windshield washer fluid reservoir). Check ground connection G201 (located at right front side of engine compartment). Check ground connection G401 (located behind left kick panel).
3. Check the following wires for opens or loose and/or disconnected terminals. See WIRING DIAGRAMS. Repair wires as necessary and recheck system operation. Check Blue/Green wire between horn relay and clockspring. Check Light Green/Red wire between cruise control unit and clockspring. Check Blue wire between cruise control unit and Ignition Control Module (ICM). Check Black/Yellow wire between cruise control unit and fuse No. 24 (15-amp), located in fuse/relay box under instrument panel. Check Light Green wire between cruise control unit and main switch. Check Gray wire between cruise control unit and brake switch. Check Orange wire between cruise control unit and Vehicle Speed Sensor (VSS). Check Brown/White wire between cruise control unit and actuator assembly. Check Brown/Black wire between cruise control unit and actuator assembly. Check Brown/Red wire between cruise control unit and actuator assembly. Check Pink wire between cruise control unit and clutch pedal switch (M/T) or gear position switch (A/T).

CRUISE CONTROL CAN BE SET, BUT INDICATOR LIGHT DOES NOT COME ON

Check gauge dimming circuit. See DIMMER CONTROL CIRCUIT under COMPONENT TESTS. Check cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS. Check ground connection G201 (located at right front side of engine compartment). Check ground connection G401 (located behind left kick panel). Repair ground connections as necessary. Check the following wires for opens or loose and/or disconnected terminals. See WIRING DIAGRAMS. Repair as necessary and recheck system operation. Check Yellow wire between fuse No. 15 (10-amp), located in fuse/relay box under instrument panel and instrument cluster Blue 13-pin connector terminal No. 4. Check Red/Blue wire between cruise control unit and instrument cluster Blue 13-pin connector terminal No. 5.

CRUISE SPEED NOTICEABLY HIGHER OR LOWER THAN WHAT WAS SET

Check actuator assembly and cable free play. See ACTUATOR ASSEMBLY under COMPONENT TESTS and ACTUATOR CABLE under ADJUSTMENTS. Check Vehicle Speed Sensor (VSS). See INSTRUMENT PANEL article. Check cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

EXCESSIVE HUNTING WHEN TRYING TO ACHIEVE SET SPEED

Check actuator assembly and cable free play. See ACTUATOR ASSEMBLY under COMPONENT TESTS and ACTUATOR CABLE under ADJUSTMENTS. Check Vehicle Speed Sensor (VSS). See INSTRUMENT PANEL article. Check cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

STEADY SPEED IS NOT HELD, EVEN ON A FLAT ROAD WITH CRUISE CONTROL SET

Check Vehicle Speed Sensor (VSS). See INSTRUMENT PANEL article. Check actuator assembly and cable free play. See ACTUATOR ASSEMBLY under COMPONENT TESTS and ACTUATOR CABLE under ADJUSTMENTS. Check cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

VEHICLE DOES NOT DECELERATE OR ACCELERATE ACCORDINGLY WHEN SET OR RESUME BUTTON IS PRESSED

Test SET/RESUME switch. See SET/RESUME SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS. Check for an open in Light Green/Black wire and Light Green/Red wire between cruise control unit and clockspring. See WIRING DIAGRAMS. Repair wires as necessary.

SET SPEED DOES NOT CANCEL WHEN CLUTCH PEDAL IS PRESSED (M/T)

Test clutch switch. See CLUTCH SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

SET SPEED DOES NOT CANCEL WHEN GEARSHIFT LEVER IS MOVED TO NEUTRAL (A/T)

Test gearshift lever position switch. See GEARSHIFT LEVER POSITION SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

SET SPEED DOES NOT CANCEL WHEN BRAKE PEDAL IS PRESSED

Test brakelight switch. See BRAKELIGHT SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

SET SPEED DOES NOT CANCEL WHEN MAIN SWITCH IS TURNED OFF

Test main switch. See MAIN SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS.

SET SPEED DOES NOT RESUME WHEN RESUME BUTTON IS PRESSED WITH MAIN SWITCH ON & SET SPEED TEMPORARILY CANCELED

Test SET/RESUME switch. See SET/RESUME SWITCH under COMPONENT TESTS. Test cruise control unit inputs. See CONTROL UNIT INPUT TEST under SYSTEM TESTS. Check for open in Light Green/Black wire and Light Green/Red wire between cruise control unit and clockspring. See WIRING DIAGRAMS. Repair wires as necessary.

REMOVAL & INSTALLATION

Note. Radio/cassette or radio/CD player contain an anti-theft protection circuit. Whenever battery is disconnected or radio fuse No. 32 (7.5-amp) is removed, radio will go into anti-theft mode. When battery voltage is restored and radio is turned on, radio displays CODE and is inoperative until proper 5-digit code number is entered by vehicle owner.

Carefully pry cover from side of SET/RESUME switch. Remove retaining screws and SET/RESUME switch. To install, reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• AIR BAG RESTRAINT SYSTEM
• INSTRUMENT PANEL