CAN Communication: Overview Lexus RX II facelift

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1. STEERING SYSTEM HANDLING PRECAUTIONS Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
2. SRS AIRBAG SYSTEM HANDLING PRECAUTIONS This vehicle is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and front passenger airbag. Failure to carry out service operations in the correct sequence could cause unexpected SRS deployment during servicing and may lead to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notice for the Supplemental Restraint System (See «AIRBAG SYSTEM»(/lexus/rx/ii-facelift-2006-2009/remont/airbag/#supplemental-restraint-system) ).
3. CONNECTOR HANDLING When inserting tester probes into a connector, insert them from the rear of the connector. Use a service wire to check the connector if it is impossible to check continuity from the rear of the connector.
4. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. SYSTEM INITIALIZATION TABLE System Name See procedure Lighting System (Adaptive Front-Lighting System) «INITIALIZATION»(ref-236032-S32462476002006062900000) Power Window Control System «INITIALIZATION»(ref-236041-S15540293112006062900000) Power Back Door System «INITIALIZATION»(ref-236020-S16519146372006062900000) Sliding roof system «INITIALIZATION»(ref-236021-S29807869632006062900000) and «INITIALIZATION»(ref-236021-S01691602862006062900000)

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HINT

The skid control ECU detects and stores steering sensor and yaw rate sensor DTCs and performs DTC communication by receiving information from the steering sensor and yaw rate sensor.

SYSTEM DESCRIPTION

1. BRIEF DESCRIPTION The CAN (Controller Area Network) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps) and the ability to detect malfunctions. By pairing the CANH and CANL bus lines, the CAN performs communication based on differential voltage. Many ECUs (sensors) installed on the vehicle operate by sharing information and communicating with each other. The CAN has two resistors of 120 --> which are necessary to communicate with the main bus line.
2. DEFINITION OF TERMS Main bus line The main bus line is a wire harness between the two terminus circuits on the bus (communication line). This is the main bus in the CAN communication system. Sub bus line The sub bus line is a wire harness which diverges from the main bus line to an ECU or sensor. Terminus circuit The terminus circuit is a circuit that converts communication current of the CAN communication into bus voltage. It consists of a resistor and condenser. Two terminus circuits are necessary on a bus.
3. ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM Skid control ECU Yaw rate sensor Steering sensor
4. DIAGNOSTIC CODE FOR CAN COMMUNICATION SYSTEM DTCs for the CAN communication system are as follows: U0121, U0123, U0124, U0126
5. REMARK FOR TROUBLESHOOTING Trouble in the CAN bus (communication line) can be checked from the DLC3 (except when there is a wire break in other than the sub bus line of the DLC3). NOTE: Do not connect the tester directly to the DLC3. Be sure to use a service wire. DTCs for the CAN communication system can be checked using the intelligent tester via the CAN VIM. ECUs cannot output DTCs if there is trouble in the sub bus line of the DLC3 even though the DLC3 is also connected to the CAN communication system.
6. HOW TO DISTINGUISH THE CAN J/C CONNECTOR In the CAN communication system, the shape of all connectors connected to the CAN J/C is the same. The connectors connected to the CAN J/C can be distinguished by the colors of the bus lines and the connecting side of the connector. HINT: See " «TERMINALS OF ECU»(ref-236034-S12239768742006062900000) " for bus line color or the type of connecting surface.

DESCRIPTION

DTC TROUBLE DETECTION CONDITION TABLE

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1. CHECK CAN BUS LINE FOR DISCONNECTION (SKID CONTROL ECU SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified value S1-11 (CANH) - S1-25 (CANL) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR

DTC TROUBLE DETECTION CONDITION TABLE

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1. CHECK WIRE HARNESS (IG, GND) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified Condition S10-2 (ESS) - Body ground Always Below 1 ohms Measure the voltage according to the value in the table below. Voltage TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified Condition S10-1 (IG) - Body ground Ignition SW ON 10 to 14 V NOTE: Perform the measurement from the back of the connector with the connector connected. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK CAN BUS LINE FOR DISCONNECTION (STEERING SENSOR SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the steering sensor connector (S10) from the steering sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value S10-9 (CANL) - S10-10 (CANH) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE STEERING SENSOR

DTC TROUBLE DETECTION CONDITION TABLE

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1. CHECK CAN BUS LINE FOR DISCONNECTION (YAW RATE SENSOR SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value Y1-2 (CANL) - Y1-3 (CANH) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: Go to next step.
2. CHECK WIRE HARNESS (IG, GND) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified Condition Y1-5 (IG) - Body ground Always Below 1 ohms Measure the voltage according to the value in the table below. Voltage TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified Condition Y1-1 (GND) - Body ground Ignition SW ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE YAW RATE SENSOR

The CAN main bus line must be disconnected when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is more than 67 ohms.

PROBLEM SYMPTOMS TABLE

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HINT

Identify the connector to be checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

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1. CHECK DLC3 Turn the ignition switch to the LOCK position. Measure the resistance according to the value in the table below. Result TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value Result D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 108 to 132 ohms A D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 132 --> or more B B: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) A: Go to next step.
2. INSPECT WIRING HARNESS CONNECTOR (CAN J/C1) Disconnect the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1). NOTE: When disconnecting, check the location of each connector. When connecting, make sure that each connector is connected properly. Measure the resistance according to the value in the table below. Resistance RESISTANCE CHECK Between the terminals where the connector was connected Condition Specified value CANH - CANL Ignition SW OFF 108 to 132 ohms NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
3. INSPECT WIRING HARNESS CONNECTOR (CAN J/C2) Disconnect the CAN main bus line connector (J43) from the wiring harness connector (CAN J/C2). NOTE: When disconnecting, check the location of each connector. When connecting, make sure that each connector is connected properly. Measure the resistance according to the value in the table below. Resistance RESISTANCE CHECK Between the terminals where the connector was connected Condition Specified value CANH - CANL Ignition SW OFF 108 to 132 ohms NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2) OK: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)

When any DTC for the CAN communication is output, first measure the resistance between the terminals of DLC3 to specify the trouble area.

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1. CHECK CAN BUS LINE (MAIN BUS LINE, BUS LINES, DLC3 SUB BUS LINE) Turn the ignition switch to the LOCK position. Measure the resistance according to the values in the table below. Result TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified condition Result D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms OK D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 67 --> or more NG-A D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 --> or less NG-B NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION NG-B: CHECK CAN BUS LINES FOR SHORT CIRCUIT OK: Go to next step.
2. CHECK CAN BUS LINE FOR SHORT TO +B (CAN-H) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: CHECK CAN BUS LINE (CAN-H) FOR SHORT TO +B OK: Go to next step.
3. CHECK CAN BUS LINE FOR SHORT TO +B (CAN-L) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: CHECK CAN BUS LINE (CAN-L) FOR SHORT TO +B OK: Go to next step.
4. CHECK CAN BUS LINE FOR SHORT TO GND (CAN-H) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND OK: Go to next step.
5. CHECK CAN BUS LINE FOR SHORT TO GND (CAN-L) Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND OK: HOW TO PROCEED WITH TROUBLESHOOTING

A short to +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 6 (CANH) of the DLC3.

PROBLEM SYMPTOMS TABLE

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HINT

Identify the connector to be the checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

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1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 SUB BUS LINE, CAN-H) Turn the ignition switch to the LOCK position. Disconnect the DLC3 sub bus line connector (J25) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H) OK: Go to next step.
2. CHECK CAN BUS LINE FOR SHORT TO +B (CAN BUSES TO CAN J/C1, CAN-H) Reconnect the DLC3 sub bus line connector (J25) to the wiring harness connector (CAN J/C1). Disconnect the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 4 OK: Go to next step.
3. CHECK CAN BUS LINE FOR SHORT TO +B (CAN MAIN BUS LINE, CAN-H) Disconnect the CAN main bus line connector (J43) from the wiring harness connector (CAN J/C2). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value J27-1 (CANH)-D1-16 (BAT) Ignition SW OFF 1 mohms or more HINT: Confirm the disconnection of the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1) during the measurement. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)
4. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE, CAN-H) Reconnect the CAN main bus line connector (J27) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU sub bus line connector (J22) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 6 OK: Go to next step.
5. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE, CAN-H) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR
6. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR SUB BUS LINE, CAN-H) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor sub bus line connector (J23) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 8 OK: Go to next step.
7. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR SUB BUS LINE, CAN-H) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor connector (S10) from the steering sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE STEERING SENSOR
8. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB-BUS LINE, CAN-H) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the yaw rate sensor sub bus line connector (J26) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
9. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB-BUS LINE, CAN-H) Reconnect the yaw rate sensor sub bus line connector (J26) to the wire harness connector (CAN J/C1). Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE YAW RATE SENSOR

A short to GND is suspected in the CAN bus line when there is continuity between terminals 4 (CG) and 6 (CANH) of the DLC3.

PROBLEM SYMPTOMS TABLE

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HINT

Identify the connector to be the checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

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1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE, CAN-H) Turn the ignition switch to the LOCK position. Disconnect the DLC3 sub bus line connector (J25) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H) OK: Go to next step.
2. CHECK CAN BUS LINE FOR SHORT TO GND (CAN BUSES TO CAN J/C1, CAN-H) Reconnect the DLC3 sub bus line connector (J25) to the wiring harness connector (CAN J/C1). Disconnect the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: Go to step 4 OK: Go to next step.
3. CHECK CAN BUS LINE FOR SHORT TO GND (CAN MAIN BUS LINE, CAN-H) Disconnect the CAN main bus line connector (J43) from the wiring harness connector (CAN J/C2). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value J27-1 (CANH) - D1-4 (CG) Ignition SW OFF 1 mohms or more HINT: Confirm the disconnection of the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1) during the measurement. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)
4. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE, CAN-H) Reconnect the CAN main bus line connector (J27) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU sub bus line connector (J22) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: Go to step 6 OK: Go to next step.
5. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE, CAN-H) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR
6. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR SUB BUS LINE, CAN-H) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor sub bus line connector (J23) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: Go to step 8 OK: Go to next step.
7. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR SUB BUS LINE, CAN-H) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor connector (S10) from the steering sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE STEERING SENSOR
8. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE, CAN-H) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the yaw rate sensor sub bus line connector (J26) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
9. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE, CAN-H) Reconnect the yaw rate sensor sub bus line connector (J26) to the wire harness connector (CAN J/C1). Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H) OK: REPLACE YAW RATE SENSOR

A short to the +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 14 (CANL) of the DLC3.

PROBLEM SYMPTOMS TABLE

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HINT

Identify the connector to be the checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

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1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 SUB BUS LINE, CAN-L) Turn the ignition switch to the LOCK position. Disconnect the DLC3 sub bus line connector (J25) from the wire harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-L) OK: Go to next step.
2. CHECK CAN BUS LINE FOR SHORT TO +B (CAN BUSES TO CAN J/C1, CAN-L) Reconnect the DLC3 sub bus line connector (J25) to the wire harness connector (CAN J/C1). Disconnect the CAN main bus line connector (J27) from the wire harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 4 OK: Go to next step.
3. CHECK CAN BUS LINE FOR SHORT TO +B (CAN MAIN BUS LINE, CAN-L) Disconnect the CAN main bus line connector (J43) from the wire harness connector (CAN J/C2). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value J27-2 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more HINT: Confirm the disconnection of the CAN main bus line connector (J27) from the wire harness connector (CAN J/C1) during the measurement. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)
4. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE, CAN-L) Reconnect the CAN main bus line connector (J27) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU sub bus line connector (J22) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 6 OK: Go to next step.
5. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE, CAN-L) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR
6. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR SUB BUS LINE, CAN-L) Reconnect the skid control ECU sub bus line connector (J22) to the wire harness connector (CAN J/C1). Disconnect the steering sensor sub bus line connector (J23) from the wire harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: Go to step 8 OK: Go to next step.
7. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR SUB BUS LINE, CAN-L) Reconnect the steering sensor sub bus line connector (J23) to the wire harness connector (CAN J/C1). Disconnect the steering sensor connector (S10) from the steering sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE STEERING SENSOR
8. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE, CAN-L) Reconnect the steering sensor sub bus line connector (J23) to the wire harness connector (CAN J/C1). Disconnect the yaw rate sensor sub bus line connector (J26) from the wire harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
9. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE, CAN-L) Reconnect the yaw rate sensor sub bus line connector (J26) to the wire harness connector (CAN J/C1). Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-14 (CANL) - D1-16 (BAT) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE YAW RATE SENSOR

A short to GND is suspected in the CAN bus line when there is continuity between terminals 4 (CG) and 14 (CANL) of the DLC3.

PROBLEM SYMPTOMS TABLE

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HINT

Identify the connector to be the checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

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1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE, CAN-L) Turn the ignition switch to the LOCK position. Disconnect the DLC3 sub bus line connector (J25) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-L) OK: Go to next step.
2. CHECK CAN BUS LINE FOR SHORT TO GND (CAN BUSES TO CAN J/C1, CAN-L) Reconnect the DLC3 sub bus line connector (J25) to the wiring harness connector (CAN J/C1). Disconnect the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: Go to step 4 OK: Go to next step.
3. CHECK CAN BUS LINE FOR SHORT TO GND (CAN MAIN BUS LINE, CAN-L) Disconnect the CAN main bus line connector (J43) from the wiring harness connector (CAN J/C2). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value J27-2 (CANL) - D1-4 (CG) Ignition SW OFF 1 mohms or more HINT: Confirm the disconnection of the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1) during the measurement. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)
4. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE, CAN-L) Reconnect the CAN main bus line connector (J27) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU sub bus line connector (J22) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: Go to step 6 OK: Go to next step.
5. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE, CAN-L) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR
6. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR SUB BUS LINE, CAN-L) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor sub bus line connector (J23) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: Go to step 8 OK: Go to next step.
7. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR SUB BUS LINE, CAN-L) Reconnect the steering sensor sub bus line connector (J23) to the wire harness connector (CAN J/C1). Disconnect the steering sensor connector (S10) from the steering sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE STEERING SENSOR
8. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE, CAN-L) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the yaw rate sensor sub bus line connector (J26) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
9. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE, CAN-L) Reconnect the yaw rate sensor sub bus line connector (J26) to the wire harness connector (CAN J/C1). Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-4 (CG) - D1-14 (CANL) Ignition SW OFF 1 kohms or more NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-L) OK: REPLACE YAW RATE SENSOR

The CAN bus lines are considered to be shorted circuit when the resistance between terminal 6 (CANH) and 14 (CANL) of the DLC3 is below 54 ohms.

PROBLEM SYMPTOMS TABLE

Scheme 52

HINT

Identify the connector to be checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

1. CHECK CAN BUS LINES FOR SHORT (DLC3 SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the DLC3 sub bus line connector (J25) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 1 mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: Go to next step.
2. CHECK CAN BUS LINES FOR SHORT (CAN BUSES TO CAN J/C1) Reconnect the DLC3 sub bus line connector (J25) to the wiring harness connector (CAN J/C1). Disconnect the CAN main bus line connector (J27) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 108 to 132 ohms NG: Go to step 4 OK: Go to next step.
3. CHECK CAN BUS LINES FOR SHORT (CAN MAIN BUS LINE) Disconnect the CAN main bus line connector (J43) from the wiring harness connector (CAN J/C2). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value J43-1 (CANH) - J43-2 (CANL) Ignition SW OFF 1 mohms or more HINT: Confirm the disconnection of the CAN main bus line from the wiring harness connector (CAN J/C1) during measurement. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)
4. CHECK CAN BUS LINES FOR SHORT (SKID CONTROL ECU SUB BUS LINE) Reconnect the CAN main bus line connector (J27) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU sub bus line connector (J22) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: Go to step 6 OK: Go to next step.
5. CHECK CAN BUS LINES FOR SHORT (SKID CONTROL ECU SUB BUS LINE) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the skid control ECU connector (S1) from the skid control ECU. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE SKID CONTROL ECU WITH ACTUATOR
6. CHECK CAN BUS LINES FOR SHORT (STEERING SENSOR SUB BUS LINE) Reconnect the skid control ECU sub bus line connector (J22) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor sub bus line connector (J23) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: Go to step 8 OK: Go to next step.
7. CHECK CAN BUS LINES FOR SHORT (STEERING SENSOR SUB BUS LINE) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the steering sensor connector (S10) from the steering angle sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE STEERING SENSOR
8. CHECK CAN BUS LINES FOR SHORT (YAW RATE SENSOR SUB BUS LINE) Reconnect the steering sensor sub bus line connector (J23) to the wiring harness connector (CAN J/C1). Disconnect the yaw rate sensor sub bus line connector (J26) from the wiring harness connector (CAN J/C1). Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1) OK: Go to next step.
9. CHECK CAN BUS LINES FOR SHORT (YAW RATE SENSOR SUB BUS LINE) Reconnect the yaw rate sensor sub bus line connector (J26) to the wiring harness connector (CAN J/C1). Disconnect the yaw rate sensor connector (Y1) from the yaw rate sensor. Measure the resistance according to the value in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION TABLE Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) Ignition SW OFF 54 to 67 ohms NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE YAW RATE SENSOR

See also:
• AIRBAG SYSTEM