Cruise Control: Overview Lexus IS II

SYSTEM DESCRIPTION

1. CRUISE CONTROL SYSTEM This system is controlled by the ECM, and is activated by the throttle position sensor and motor. The ECM controls the following functions: ON-OFF, - (COAST)/SET, + (ACCEL)/RES (RESUME), CANCEL, vehicle speed operation, motor output control, and overdrive control. The ECM compares the driving vehicle speed from the speed sensor with the stored vehicle speed set through the cruise control main switch. The ECM instructs the throttle valve motor of the throttle body assembly to close the valve when the driving speed is greater than the stored speed, and instructs it to open the valve when the driving speed is less than the stored speed. The ECM receives signals such as ON-OFF, - (COAST)/SET, + (ACCEL)/RES (RESUME), and CANCEL from the cruise control main switch and executes the command. The ECM illuminates the combination meter's CRUISE main indicator light when it receives a cruise control main switch ON signal. The ECM cancels the cruise control system when the brake pedal is depressed and the ECM receives a stop light switch signal. The ECM cancels the cruise control system when the shift lever is moved from the D to the N position or the transmission is shifted to the 3rd, 2nd, or 1st gear with the shift lever in the S position, and the ECM receives a park/neutral position switch signal. The ECM cancels the cruise control system when the clutch pedal is depressed and the ECM receives a clutch switch signal.
2. LIMIT CONTROL Low speed limit The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. Cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit 40 km/h (25mph) while the cruise control is in operation. High speed limit The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, + (ACCEL)/RES (RESUME) cannot be used to increase speed beyond the high speed limit.
3. OPERATION OF CRUISE CONTROL The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAPUP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. SET CONTROL Vehicle speed is stored and constant speed control is maintained when pushing the cruise control main switch to - (COAST)/SET while driving with the main switch on (the CRUISE main indicator light is on), and the vehicle speed is within the set speed range (between the low and high speed limits). - (COAST) CONTROL When the cruise control main switch is set to - (COST)/SET and held in that position while the cruise control system is operating, the ECM sends a "throttle valve opening angle 0°" demand signal to the cruise control system. Then the vehicle speed, when the cruise control main switch is released, is stored and maintained. HINT: An actual throttle valve opening angle of 0° is not possible due to the idle speed control, etc. TAP-DOWN CONTROL When tapping down the cruise control main switch to - (COAST)/SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). When the cruise control main switch is released from - (COAST)/SET and the difference between the driving and stored vehicle speed is more than 5 km/h (3 mph), the driving vehicle speed is stored and constant speed control is maintained. ACCELERATION CONTROL The throttle valve motor of the throttle body assembly is instructed by the ECM to open the throttle valve when + (ACCEL)/RES (RESUME) on the cruise control main switch is pressed and held while the cruise control system is in operation. When the cruise control main switch is released from + (ACCEL)/RES (RESUME), the vehicle speed is stored and the vehicle is controlled at a constant speed. TAP-UP CONTROL When tapping up the cruise control main switch to + (ACCEL)/RES (RESUME) (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than 5 km/h (approximately 3.1 mph), the stored vehicle speed will not be changed. RESUME CONTROL If cruise control operation was canceled with the stop light switch or the CANCEL switch, and if driving speed is within the limit range, pushing the cruise control main switch to + (ACCEL)/RES (RESUME) restores vehicle speed memorized at the time of cancellation, and maintains constant speed control. MANUAL CANCEL CONTROL Performing any of the following cancels the cruise control system while in operation (the stored vehicle speed in the ECM is maintained). Depressing the brake pedal Depressing the clutch pedal The shift lever is moved from the D to the N position or the transmission is shifted to the 3rd, 2nd, or 1st gear with the shift lever in the S position. Pushing the cruise control main switch to CANCEL Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained).
4. AUTO CANCEL (FAIL-SAFE) This system has an automatic cancellation function (failsafe) (see «TERMINALS OF ECM»(ref-235581-S28786568912006062400000) ).

DESCRIPTION

Refer to DTC P0500 (see DTC P0500 VEHICLE SPEED SENSOR "A" ).

DIAGNOSTIC TROUBLE CODE CHART

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP SW fuse and the stop light switch, and the ECM turns the cruise control off.

DIAGNOSTIC TROUBLE CODE CHART

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1. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG), and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the stop light switch. ECM (Cruise control): DATA LIST CHART Item Measurement Item / Di(Range) Normal Condition Diagnostic Note STP LIGHT SW M Stop light switch signal (Main CPU) / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - OK: When the brake pedal is operated, the display changes as shown above. OK : REPLACE ECM NG: Go To Next Step
2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY) Disconnect the A22 connector from the stop light switch. Measure the voltage according to the value(s) in the table below Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A22-2 - Body ground Always 10 to 14 V A22-3 - Body ground Engine switch on (IG) 10 to 14 V NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
3. INSPECT STOP LIGHT SWITCH Remove stop light switch. (See «REMOVAL»(ref-235547-S21959399112006062400000) ) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 Switch pin not pushed Below 1ohms 3 - 4 Switch pin not pushed 10 kohms or higher 1 - 2 Switch pin pushed 10 kohms or higher 3 - 4 Switch pin pushed Below 1ohms Install the stop light switch. NG: REPLACE STOP LIGHT SWITCH OK: Go To Next Step
4. CHECK ECM Reconnect the stop light switch connector. Disconnect the A5 and A6 connectors from the ECM. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Brake Pedal Condition Specified Condition A6-4 (STP) - Body ground Depressed 10 to 14 V A6-4 (STP) - Body ground Released Below 1 V A5-8 (ST1-) - Body ground Depressed Below 1 V A5-8 (ST1-) - Body ground Released 10 to 14 V NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) OK : REPLACE ECM

This DTC indicates the internal abnormalities of the ECM.

DIAGNOSTIC TROUBLE CODE CHART

HINT

The ECM receives signals from each sensor to control all functions of the cruise control system. When a trouble code is detected, the fail-safe function remains on until the engine switch is turned off.

1. REPLACE ECM END

Clutch switch circuit inspection is necessary for M/T vehicles.

When the clutch pedal is released, the ECM receives positive (+) battery voltage through the LH-IG fuse. While depressing the clutch pedal, the clutch switch sends a signal to terminal CLSW of the ECM. The ECM cancels cruise control drive when terminal CLSW receives the signal.

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1. INSPECT ECM (CLSW TERMINAL) Disconnect the A5 connector from the ECM. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A5-9 (CLSW) - Body ground Clutch pedal depressed Below 1 V Clutch pedal released 10 to 14 V NG : Go to step 2 OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT CLUTCH SWITCH Turn the engine switch off. Disconnect the A21 connector from the clutch switch. Remove the clutch switch. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 1 - 2 Switch pin free (Clutch pedal depressed) 10 kohms or higher Switch pin pushed in (Clutch pedal released) Below 1ohms NG : REPLACE CLUTCH SWITCH OK : Go To Next Step
3. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH SWITCH) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A5-9 (CLSW) - A21-2 Always Below 1ohms A5-9 (CLSW) - Body ground Always 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - CLUTCH SWITCH)

The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL.

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1. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the cruise control main switch. ECM (Cruise control): DATA LIST CHART Item Measurement Item/Display (Range) Normal Condition Diagnostic Note MAIN SW (MAIN) Main switch signal (Main CPU)/ ON or OFF ON: Main switch on (Pushed on) OFF: Main switch off (Pushed off) - CANCEL SW CANCEL switch signal/ON or OFF ON: CANCEL switch on OFF: CANCEL switch off - SET/COAST SW SET/COAST switch signal/ON or OFF ON: - (COAST)/SET switch on OFF: - (COAST)/SET switch off - RES/ACC SW RES/ACC switch signal/ON or OFF ON: + (ACCEL)/RES (RESUME) switch on OFF: + (ACCEL)/RES (RESUME) switch off - OK: When the cruise control main switch is operated, the display changes as shown above. Result: RESULT REFERENCE Result Proceed to OK A NG (All items are defective) B NG (1 to 3 items are defective) C A : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C : REPLACE CRUISE CONTROL MAIN SWITCH B: Go To Next Step
2. INSPECT CRUISE CONTROL MAIN SWITCH Remove the «CRUISE CONTROL MAIN SWITCH»(ref-235581-S26494585262006062400000). Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition A-1 (CCS) - A-3 (ECC) Neutral 10 kohms or higher A-1 (CCS) - A-3 (ECC) + (ACCEL)/RES (RESUME) 216 to 264 ohms A-1 (CCS) - A-3 (ECC) - (COAST)/SET 567 to 693 ohms A-1 (CCS) - A-3 (ECC) CANCEL 1,386 to 1,694 ohms A-1 (CCS) - A-3 (ECC) Main Switch off 10 kohms or higher A-1 (CCS) - A-3 (ECC) Main Switch on Below 1ohms NG: REPLACE CRUISE CONTROL MAIN SWITCH OK: Go To Next Step
3. CHECK HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE) Disconnect the m1 connector from the spiral cable. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester connection Specified condition A-1 - m1-3 Below 1ohms A-3 - m1-4 Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
4. CHECK SPIRAL CABLE NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the example shown in the brackets. HINT: Removal (See «REMOVAL»(ref-235542-S33599905202006062400000) ) Installation (See «INSTALLATION»(ref-235542-S27816112932006062400000) ) Remove the spiral cable. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Spiral Cable Position Specified Condition m1-3 - J24-1 (CCS) Center Below 1ohms 2.5 rotations to the left 2.5 rotations to the right m1-4 - J24-2 (ECC) Center Below 1ohms 2.5 rotations to the left 2.5 rotations to the right HINT: The spiral cable makes a maximum of approximately 5 rotations. NG: REPLACE SPIRAL CABLE OK: Go To Next Step
5. CHECK WIRE HARNESS (SPIRAL CABLE - ECM AND BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J24-1 - A6-31 (CCS) Always Below 1ohms A6-31 (CCS) - Body ground Always 10 kohms or higher J24-2 (ECC) - Body ground Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE ECM

1. The ECM detects a cruise control switch signal and sends it to the combination meter through CAN and BEAN. Then the CRUISE main indicator light comes on.
2. The CRUISE main indicator light circuit uses CAN and BEAN for communication. If there is a malfunction in this circuit, check for DTCs in the CAN communication system and multiplex communication system before troubleshooting this circuit.

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Check the CRUISE main indicator light by performing ACTIVE TEST. Combination meter: ACTIVE TEST REFERENCE CHART Item Test Details Diagnostic Note CRUISE INDIC Turns CRUISE main indicator light ON / OFF - OK: Indicator light comes on / goes off. NG : REPLACE COMBINATION METER ASSEMBLY OK : Go To Next Step
2. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the CRUISE main indicator light. ECM (Cruise control): DATA LIST REFERENCE Item Measurement Item / Di(Range) Normal Condition Diagnostic Note CCS INDICATOR M Cruise indicator signal (Main CPU) / ON or OFF ON: "CRUISE" on OFF: "CRUISE" off - OK: When the cruise control main switch is operated, the display changes as shown above. NG : REPLACE ECM OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Connecting terminals TC and CG of the DLC3 causes the system to enter self-diagnostic mode. If a malfunction is present, DTCs will be output.

HINT

When a particular warning light remains blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in the relevant ECU is suspected.

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1. CHECK WIRE HARNESS (TERMINAL TC of DLC3 - ECM) Disconnect the A6 connector from the ECM. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A6-3 (TC) - J21-13 (TC) Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - ECM) OK : Go To Next Step
2. CHECK WIRE HARNESS (TERMINAL CG of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester connection Condition Specified condition J21-4 (CG) - Body ground Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - BODY GROUND) OK : Go To Next Step
3. CHECK WIRE HARNESS (TERMINAL TC of DLC3 - BODY GROUND)

1. Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

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NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Refer to DTC P0500 (see DTC P0500 VEHICLE SPEED SENSOR "A" ).

DIAGNOSTIC TROUBLE CODE CHART

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP SW fuse and the stop light switch, and the ECM turns the cruise control off.

DIAGNOSTIC TROUBLE CODE CHART

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1. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG), and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the stop light switch. ECM (Cruise control): DATA LIST REFERENCE CHART Item Measurement Item / Di(Range) Normal Condition Diagnostic Note STP LIGHT SW M Stop light switch signal (Main CPU) / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - OK: When the brake pedal is operated, the display changes as shown above. OK : REPLACE ECM NG: Go To Next Step
2. INSPECT STOP LIGHT SWITCH Disconnect the stop light switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 Switch pin not pushed Below 1ohms 3 - 4 Switch pin not pushed 10 kohms or higher 1 - 2 Switch pin pushed 10 kohms or higher 3 - 4 Switch pin pushed Below 1ohms NG : REPLACE STOP LIGHT SWITCH OK : Go To Next Step
3. CHECK WIRE HARNESS (STOP LIGHT SWITCH - BATTERY) Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A22-2 - Body ground Always 10 to 14 V A22-3 - Body ground Engine switch on (IG) 10 to 14 V NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
4. CHECK ECM Reconnect the stop light switch connector. Disconnect the A5 and A6 connectors from the ECM. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Brake Pedal Condition Specified Condition A6-4 (STP) - Body ground Depressed 10 to 14 V A6-4 (STP) - Body ground Released Below 1 V A5-8 (ST1-) - Body ground Depressed Below 1 V A5-8 (ST1-) - Body ground Released 10 to 14 V

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM)

OK : REPLACE ECM

This DTC indicates a malfunction in the ECM.

HINT

The ECM receives signals from each sensor to control all the functions of the cruise control with the microcomputer. When a malfunction is detected, fail-safe remains on until the engine switch is turned off.

DIAGNOSTIC TROUBLE CODE CHART

1. REPLACE ECM

The millimeter wave radar sensor emits radar beams towards an object in front and measures the distance and direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed between your own vehicle and an object in front. This data is transmitted to the cruise control ECU (distance control ECU).

DIAGNOSTIC TROUBLE CODE CHART

HINT

The millimeter wave radar sensor monitors the millimeter wave circuit activation by itself. This DTC is output when one of the following occurs: 1) the monitor is malfunctioning, 2) an EEPROM error is detected, 3) a voltage error is detected, and 4) the radar sensor is not adjusted. When raindrops or snowflakes strike the millimeter wave radar sensor face, the distance between the vehicle in front and your own vehicle cannot be measured correctly. The dynamic radar cruise control system functions by detecting the beam reflections from the vehicle directly in front. In the following cases, the system may not be able to detect the vehicle in front and may not properly maintain the correct vehicle-to-vehicle distance

1. The vehicle in front is a tall trailer.
2. Emission from the vehicle in front or vehicle in other lanes are heavy.

Note. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (see REMOVAL ).

1. ADJUST MILLIMETER WAVE RADAR SENSOR Refer to «ADJUSTMENT»(ref-235581-S39061972312006062400000). HINT: It is necessary to make the ECM recognize specification information (whether the vehicle is equipped with the dynamic radar cruise control system or not). When this procedure has not been carried out, this DTCs may be output. Clear the DTC and then recheck for DTCs. OK: DTC is not output NG: REPLACE MILLIMETER WAVE RADAR SENSOR OK: SYSTEM OK

This DTC is output when the scanning angle of the millimeter wave radar sensor is incorrect. This DTC is also output when the millimeter wave radar sensor beam axis is determined to be in an incorrect position.

DIAGNOSTIC TROUBLE CODE CHART

Note. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (see REMOVAL ).

1. ADJUST MILLIMETER WAVE RADAR SENSOR Refer to «ADJUSTMENT»(ref-235581-S39061972312006062400000). HINT: It is necessary to make the ECM recognize specification information (whether the vehicle is equipped with the dynamic radar cruise control system or not). If this procedure has not been carried out, this DTCs may be output. Clear the DTCs and then recheck for DTCs. OK: DTC is not output NG: REPLACE MILLIMETER WAVE RADAR SENSOR OK: SYSTEM IS OK

The ABS & traction actuator (skid control ECU) receives an alarm demand signal from the ECU and operates the skid control buzzer. The buzzer sounds to warn that the distance between the vehicle in front and your own vehicle is decreasing.

DIAGNOSTIC TROUBLE CODE CHART

HINT

If the vehicle ahead in the same lane significantly decreases its speed or another vehicle moves in front of your vehicle, adequate deceleration cannot be applied and the vehicle-to-vehicle distance will shorten. At this time, the system sounds the buzzer and the master warning light blinks to inform the driver. This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

This DTC is output when the VSC system has a problem. Check the VSC system when this DTC is output.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK BRAKE SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235467-S04750049282006062200000).

The distance control ECU receives information about the area in front of the vehicle from the millimeter wave radar sensor and then sends a brake control demand signal (deceleration demand) and diagnosis signals, such as millimeter wave radar sensor grime signals or millimeter wave radar sensor malfunction signals, to the ECM.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

The ECM receives signals from each sensor and ECU, then sends signals such as A/T signals, cruise control operation signals, low speed operation signals, brake control operation signals, and radar light emission prohibiting signals, to the distance control ECU. The ECM is the only component that has a function to record and output the DTCs in the dynamic radar cruise control system. Therefore, if the distance control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

In the dynamic radar cruise control system, the ECM and the distance control ECU (cruise control ECU) communicate with one another to control the system based on some designation information. If the designation information of the ECM and distance control ECU is different or the distance control ECU is malfunctioning, this DTC is recorded.

DIAGNOSTIC TROUBLE CODE CHART

Note. When the distance control ECU is replaced with a new one, initialization must be performed (see REMOVAL ).

1. CONFIRM DESIGNATION INFORMATION Confirm the designation information. Turn the engine switch on (IG). Turn the cruise control main switch on. With the brake pedal depressed, push the cruise control main switch to + (ACCEL)/RES (RESUME) 3 times within 3 seconds. Check that the skid control buzzer sounds at this time. OK: The skid control buzzer sounds. (Initialization is performed.) NOTE: Do not turn the light control switch on at this time because the beam axis automatic adjustment mode has already started, which could lead to incorrect beam axis. If the light control switch is turned on by mistake, readjust the beam axis (refer to example for beam axis «ADJUSTMENT»(ref-235581-S39061972312006062400000) ). If initialization cannot be performed, first inspect the stop light switch circuit, cruise main switch circuit, and skid control buzzer circuit. NG: REPLACE DISTANCE CONTROL ECU OK: Go To Next Step
2. CHECK DTC Clear the DTCs and then recheck for DTCs. Result RESULT REFERENCE Result Proceed to DTC is not output A DTC is output B HINT: If DTC P1617 is still output after replacing the distance control ECU, replace the ECM. B : REPLACE DISTANCE CONTROL ECU A : END

The skid control ECU sends signals such as cruise control cancel demand signals and brake operation demand from ECM response signals to the ECM when the dynamic radar cruise control system is in operation.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU when the dynamic radar cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic radar cruise control system. Therefore, if the skid control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

This circuit detects the yaw rate of the vehicle and transmits its signal to the skid control ECU and distance control ECU.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

This circuit detects the angle and direction of the steering wheel and automatically transmits a signal to the skid control ECU and distance control ECU.

DIAGNOSTIC TROUBLE CODE CHART

HINT

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

1. CHECK CAN COMMUNICATION SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235565-S11257827982006062400000).

The millimeter wave radar sensor and distance control ECU (cruise control ECU) transmit the data for general vehicle control and diagnosis function along the communication line. The millimeter wave radar sensor transmits information about the vehicle in front to the distance control ECU (cruise control ECU).

DIAGNOSTIC TROUBLE CODE CHART

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Note. When the distance control ECU is replaced with a new one, initialization must be performed (see REMOVAL ). When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (see INSTALLATION ).

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1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR) Disconnect the distance control ECU and millimeter wave radar sensor connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-22 (LRDD) - B9-3 (LRDD) Always Below 1ohms J17-13 (IGB) - B9-5 (IGB) Always Below 1ohms J17-22 (LRDD) - Body ground Always 10 kohms or higher J17-13 (IGB) - Body ground Always 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
2. CHECK DISTANCE CONTROL ECU Disconnect the millimeter wave radar sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-13 (IGB) - Body ground Engine switch on (IG) 10 to 14 V J17-22 (LRDD) - J17-10 (SGND) Engine switch on (IG) 4.5 to 5.5 V NG : REPLACE DISTANCE CONTROL ECU OK : Go To Next Step
3. CHECK MILLIMETER WAVE RADAR SENSOR Reconnect the millimeter wave radar sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester connection Condition Specified Condition B9-5 (IGB) - Body ground Engine switch on (IG) 10 to 14 V Check the signal waveform between terminal LRDD (B9- 3) of the millimeter wave radar sensor and body ground. OK: A waveform similar to that in the illustration on the left is output. HINT: Gauge set: 2 V/DIV., 10 msec./DIV. Condition: Engine switch on (IG) NG : REPLACE MILLIMETER WAVE RADAR SENSOR OK : END (INTERMITTENT PROBLEM IS PRESENT)

The millimeter wave radar sensor and distance control ECU (cruise control ECU) transmit the data for general vehicle control and diagnosis function along the communication line. The distance control ECU (cruise control ECU) determines the curve radius information based on signals from the steering wheel and yaw rate sensor. The distance control ECU (cruise control ECU) transmits the current vehicle speed and curve radius information to the millimeter wave radar sensor.

DIAGNOSTIC TROUBLE CODE CHART

Scheme 27

Note. When the distance control ECU is replaced with a new one, initialization must be performed (see REMOVAL ). When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (see INSTALLATION ).

Scheme 28

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1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR) Disconnect the distance control ECU and millimeter wave radar sensor connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-23 (LRRD) - B9-4 (LRRD) Always Below 1ohms J17-13 (IGB) - B9-5 (IGB) Always Below 1ohms J17-23 (LRRD) - Body ground Always 10 kohms or higher J17-13 (IGB) - Body ground Always 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
2. CHECK DISTANCE CONTROL ECU Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-13 (IGB) - Body ground Engine switch on (IG) 10 to 14 V NG : REPLACE DISTANCE CONTROL ECU OK : Go To Next Step
3. CHECK MILLIMETER WAVE RADAR SENSOR Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition B9-5 (IGB) - Body ground Engine switch on (IG) 10 to 14 V Check the signal waveform between terminal LRRD (B9- 4) of the millimeter wave radar sensor and body ground. OK: A waveform similar to that in the illustration on the left is output. HINT: Gauge set: 2 V/DIV., 5 msec./DIV. Condition: Engine switch on (IG) NG : REPLACE MILLIMETER WAVE RADAR SENSOR OK : END (INTERMITTENT PROBLEM IS PRESENT)

The cruise control main switch operates 8 functions: SET, -(COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL, and MODE. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. The ECM then reads the voltage value that has been changed by the switch operation to control MODE, SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL. The dynamic radar cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.

1. The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar cruise control system.
2. The operation of the constant speed control mode is the same as that for a conventional cruise control system.

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Scheme 36

1. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the cruise control main switch. ECM (Cruise control): DATA LIST REFERENCE CHART Item Measurement Item / Di(Range) Normal Condition Diagnostic Note MAIN SW (MAIN) Main switch signal (Main CPU) / ON or OFF ON: Main switch ON (Pushed on) OFF: Main switch OFF (Pushed off) - CANCEL SW CANCEL switch signal / ON or OFF ON: CANCEL switch ON OFF: CANCEL switch OFF - SET/COAST SW SET/COAST switch signal / ON or OFF ON: - (COAST)/SET switch ON OFF: - (COAST)/SET switch OFF - RES/ACC SW RES/ACC switch signal / ON or OFF ON: + (ACCEL)/RES (RESUME) switch ON OFF: + (ACCEL)/RES (RESUME) switch OFF - OK: When the cruise control main switch is operated, the display changes as shown above. Result: RESULT REFERENCE Result Proceed to OK A NG (all items are defective) B NG (1 to 3 items are defective) C A : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C : REPLACE CRUISE CONTROL MAIN SWITCH B: Go To Next Step
2. INSPECT CRUISE CONTROL MAIN SWITCH Disconnect the cruise control main switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition A-1 (ECC) - A-2 (R/N), A-1 (ECC) - A-3 (CCS) Neutral 10 kohms or higher A-1 (ECC) - A-3 (CCS) + (ACCEL)/RES (RESUME) 216 to 264 ohms A-1 (ECC) - A-3 (CCS) - (COAST)/SET 567 to 693 ohms A-1 (ECC) - A-3 (CCS) CANCEL 1,386 to 1,694 ohms A-1 (ECC) - A-3 (CCS) Main Switch off 10 kohms or higher A-1 (ECC) - A-3 (CCS) Main Switch on Below 1ohms A-1 (ECC) - A-2 (R/N) Main Switch on and MODE Switch on Below 1ohms NG : REPLACE CRUISE CONTROL MAIN SWITCH OK : Go To Next Step
3. INSPECT SPIRAL CABLE NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the example shown in the brackets. HINT: Removal (See «REMOVAL»(ref-235542-S33599905202006062400000) ) Installation (See «INSTALLATION»(ref-235542-S27816112932006062400000) ) Remove the spiral cable. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Condition Spiral Cable Position Specified Condition m1-1 - J24-7 Center Below 1 ohms 2.5 rotations to the left 2.5 rotation to the right m1-3 - J24-1 Center Below 1ohms 2.5 rotation to the left 2.5 rotation to the right m1-4 - J24-2 Center Below 1ohms 2.5 rotation to the left 2.5 rotation to the right HINT: The spiral cable makes a maximum of approximately 5 rotations. NG: REPLACE SPIRAL CABLE OK: Go To Next Step
4. CHECK WIRE HARNESS (SPIRAL CABLE - ECM) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J24-1 - A6-31 (CCS) Always Below 1ohms J24-7 - A5-20 (CCHG) Always Below 1ohms J24-1 - Body ground Always 10 kohms or higher J24-7 - Body ground Always 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : Go To Next Step
5. CHECK WIRE HARNESS (SPIRAL CABLE - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J24-2 - Body ground Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit provides power to operate the distance control ECU (cruise control ECU). The distance control ECU determines information about the vehicle in front based on data from the radar sensor, and then decides how much acceleration and/or deceleration is needed to maintain the set distance. The distance control ECU also requests the skid control ECU to apply braking and to sound the buzzer.

Scheme 37

Scheme 38

1. CHECK DISTANCE CONTROL ECU Disconnect the distance control ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-1 (B) - Body ground Engine switch on (IG) 10 to 14 V Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-10 (SGND) - Body ground Always Below 1ohms J17-12 (GND) - Body ground Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit provides power to the millimeter wave radar sensor. The millimeter wave radar sensor emits radio waves towards an object in front and measures the distance and direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed between the vehicle and the object in front. This data is transmitted to the distance control ECU (cruise control ECU). The ECU recognizes the millimeter wave radar sensor via terminals LGND. If an open circuit occurs in the wire harness between terminals LGND, the ECM cannot recognize the millimeter wave radar sensor. The ECM will stop the control of the vehicle-to-vehicle distance control mode and only the constant speed control mode can be used.

Scheme 39

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Scheme 42

1. CHECK DISTANCE CONTROL ECU (IGB VOLTAGE) Disconnect the B9 sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition B9-5 (IGB) - Body ground Engine switch on (IG) 10 to 14 V NG : Go to step 3 OK : Go To Next Step
2. CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND) Disconnect the B9 sensor connector. Disconnect the A5 ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Specified Condition A5-9 (LGND) - B9-1 (LGND) Below 1ohms B9-1 (LGND) - Body ground 10 kohms or higher B9-2 (SGND) - Body ground Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3. CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) Disconnect the B9 sensor connector. Disconnect the J17 ECU connector. Measure the resistance according to the value(s) in the table below Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Specified Condition B9-5 (IGB) - J17-13 (IGB) Below 1ohms J17-13 (IGB) - Body ground 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The distance control switch sets the vehicle-to-vehicle distance control mode. The distance control switch is installed in the steering pad switch. The vehicle-to-vehicle distance set value can be changed by operating the steering pad switch (distance control switch) while the dynamic radar cruise control system is in operation. The steering pad switch uses the BEAN to communicate with each ECU. Therefore, it does not have a direct connection with the ECM. If there are any malfunctions in the communication line of the steering pad switch, one or more DTCs in the multiplex communication system are output.

Scheme 43

Note. When the distance control ECU is replaced with a new one, initialization must be performed (see REMOVAL ).

Scheme 44

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1. INSPECT DISTANCE CONTROL ECU Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J17-16 (MODE) - J17-12 (GND) Distance control switch ON (pushed) 0 to 2 V Distance control switch OFF (pushed) 10 to 14 V OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go To Next Step
2. INSPECT DISTANCE CONTROL ECU CIRCUIT Disconnect the J17 connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester connection Condition Specified condition J17-16 (MODE) - Body ground Distance control switch ON (pushed) Below 1ohms Distance control switch OFF (pushed) 10 kohms or higher OK : REPLACE DISTANCE CONTROL ECU NG: Go To Next Step
3. INSPECT STEERING PAD SWITCH ASSEMBLY Remove the steering pad (See «WIRING DIAGRAM»(ref-235542-S13291953542006062400000) ). Disconnect K1 connector from the spiral cable. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition K1-4 (DIST) - K1-6 (ECC) Distance control switch ON (pushed) Below 2.5 ohms K1-4 (DIST) - K1-6 (ECC) Distance control switch OFF (pushed) 10 kohms or higher NG: REPLACE STEERING PAD SWITCH OK: Go To Next Step
4. CHECK HARNESS AND CONNECTOR (ECM - SPIRAL CABLE) NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the example shown in the brackets. HINT: Removal (See «REMOVAL»(ref-235542-S33599905202006062400000) ) Installation (See «INSTALLATION»(ref-235542-S27816112932006062400000) ) Remove the spiral cable. Disconnect the J17 connector from the distance control ECU. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Specified Condition J24-11 (DIST) - J17-16 (MODE) Below 1ohms J24-11 - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE SPIRAL CABLE

When the distance control ECU (cruise control ECU) detects that the wipers are operating, the dynamic radar cruise control system will be canceled.

HINT

A wiper switch signal is sent to the distance control ECU via the CAN and BEAN. If there are any malfunctions in this circuit, check for DTCs in the CAN communication and multiplex communication systems. When the wiper is in the HI mode, the dynamic radar cruise control is automatically canceled and goes into the standby mode.

1. INSPECT WIPER AND WASHER SYSTEM Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235575-S28555641122006062400000). OK: Wiper function is normal. NG: GO TO «WIPER AND WASHER SYSTEM»(ref-235575-S07100926182006062400000) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

When the cruise control main switch is on, the CRUISE main indicator light and RADAR READY indicator come on. This indicates the control condition (presence or absence of a vehicle in front, vehicle-to-vehicle distance, and set vehicle speed) and fail-safe state through the multiplex communication and CAN communication system. The master warning light and CRUISE main indicator light come on and vehicle to- vehicle distance information is displayed on the combination meter as the alarm buzzer sounds. Items such as "Clean Radar Sensor", "Cruise not Available", "Check Cruise System", and "Radar Cruise Ready" are displayed on the multi-information display on the combination meter when the ECM detects signals from each sensor and actuator and sends them to the combination meter via CAN and BEAN.

HINT

If the vehicle in front in the same lane significantly decreases vehicle speed or another vehicle moves in front of your vehicle, adequate deceleration cannot be applied and the vehicle-to-vehicle distance will shorten. At this time, the system sounds the buzzer and the master warning light blinks to warn the driver. Each indicator in the dynamic radar cruise control uses CAN and BEAN for communication. Therefore, if there are any malfunctions in this circuit, check for DTCs in the CAN communication and multiplex communication systems before troubleshooting this circuit.

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check that the CRUISE main indicator light comes on. Combination meter (Meter ECU): ACTIVE TEST REFERENCE CHART Item Test Details Diagnostic Note CRUISE INDIC Turns CRUISE main indicator light ON / OFF - OK: Indicator light comes on. NG : REPLACE COMBINATION METER ASSEMBLY OK : Go To Next Step
2. READ VALUE ON INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG), and turn the intelligent tester main switch on. Check the DATA LIST for proper functioning of the CRUISE main indicator light. ECM (Cruise control): DATA LIST REFERENCE CHART Item Measurement Item / Di(Range) Normal Condition Diagnostic Note CCS READY M Cruise control system standby condition (Main CPU) / ON or OFF Each time main switch is pushed, ON/OFF changes 1 CCS INDICATOR M Cruise indicator signal (Main CPU) / ON or OFF ON : "CCS READY" ON OFF : "CCS READY" OFF 2 OK: When the cruise control main switch is operated, the display changes as shown above. HINT: 1 is OK, but 2 is NG --> DTC output or ECM failure NG : REPLACE ECM OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Connecting terminals TC and CG of the DLC3 causes the system to enter the self-diagnostic mode. If a malfunction is present, DTCs will be output.

HINT

When a particular warning light remains blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in the relevant ECU is suspected.

Scheme 48

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1. CHECK WIRE HARNESS (TERMINAL TC of DLC3 - ECM) Disconnect the A6 connector from the ECM. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition A6-3 (TC) - J21-13 (TC) Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - ECM) OK : Go To Next Step
2. CHECK WIRE HARNESS (TERMINAL CG of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J21-4 (CG) - Body ground Always Below 1ohms NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - BODY GROUND) OK : Go To Next Step
3. CHECK WIRE HARNESS (TERMINALTC of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition J21-13 (TC) - Body ground Always 10 kohms or higher NG : REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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Scheme 53

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation (See «AIRBAG SYSTEM»(ref-235542-S13106599752006062400000) ).
2. REMOVE NO. 2 LOWER STEERING WHEEL COVER
3. REMOVE NO. 3 LOWER STEERING WHEEL COVER
4. REMOVE STEERING PAD (See «REMOVAL»(ref-235542-S05597931522006062400000) )
5. REMOVE CRUISE CONTROL MAIN SWITCH Disconnect the connector. Remove the 2 screws and the cruise control main switch.

Scheme 54

1. INSPECT CRUISE CONTROL MAIN SWITCH Remove the cruise control main switch Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition A-1(ECC) - A-2(R/N), A-1(ECC) - A-3(CCS) Neutral 10 kohms or higher A-1(ECC) - A-3(CCS) + (ACCEL)/RES (RESUME) 216 to 264ohms A-1(ECC) - A-3(CCS) - (COAST)/SET 567 to 693ohms A-1(ECC) - A-3(CCS) CANCEL 1,386 to 1,694ohms A-1(ECC) - A-3(CCS) Main Switch off 10kohms or higher A-1(ECC) - A-3(CCS) Main Switch on Below 1ohms A-1(ECC) - A-2(R/N) Main Switch on and Mode Switch on Below 1ohms If the result is not as specified, replace the cruise control main switch

Scheme 55

1. INSTALL CRUISE CONTROL MAIN SWITCH Install the cruise control main switch with the 2 screws. Torque: 1.7 to 3.0 N*m (17 to 31 kgf*cm, 15 to 27 in.*lbf) Connect the connector.
2. INSTALL STEERING PAD (See «INSTALLATION»(ref-235542-S14674145642006062400000) )
3. INSTALL NO. 3 LOWER STEERING WHEEL COVER
4. INSTALL NO. 2 LOWER STEERING WHEEL COVER
5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
6. PERFORM INITIALIZATION NOTE: Some systems need initialization when disconnecting the cable from the negative battery terminal (See «INITIALIZATION»(ref-235541-S32349848442006062400000) ).
7. INSPECT SRS WARNING LIGHT (See «PROBLEM SYMPTOMS TABLE»(ref-235542-S10426029612006062400000) )

Scheme 56

See also:
• DTC P0500 VEHICLE SPEED SENSOR "A"