CAN Communication (Diagnostics): Other

TERMINALS OF ECU

Note. Turn the Ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open. HINT: Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

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Scheme 138: TERMINALS OF ECU

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JUNCTION CONNECTOR D-CAN Junction Connector Wiring color D-CAN junction connector Terminal No. (Symbol) Color ABS and Traction Actuator (Skid Control ECU) (CAN-H) F46-1 (ABS) G ABS and Traction Actuator (Skid Control ECU) (CAN-H) F46-12 (ABS) W Steering sensor (CAN-H)*2 F46-2 (STR) SB Steering sensor (CAN-L)*2 F46-13 (STR) W DLC 3 (CAN-H) F46-3 (OBD) V DLC 3 (CAN-L) F46-14 (OBD) W ECM (CAN-H) F46-4 (EFI) L ECM (CAN-L) F46-15 (EFI) W Main Body ECU (CAN-H) F46-5 (JB) R Main Body ECU (CAN-L) F46-16 (JB) W Air conditioning amplifier (CAN-H) F46-6 (A/C) V Air conditioning amplifier (CAN-L) F46-17 (A/C) W Center airbag sensor assembly (CAN-H) F46-8 (A/B) B Center airbag sensor assembly (CAN-L) F46-19 (A/B) W CAN Main wire (between D-CAN junction connector and P-CAN junction connector (CAN-H)) F46-11 (TORH) Y CAN Main wire (between D-CAN junction connector and P-CAN junction connector (CAN-L)) F46-22 (TORH) W P-CAN Junction Connector Wiring color P-CAN junction connector Terminal No. (Symbol) Color Yaw Rate Sensor (CAN-H) F47-2 (YAW) BE Yaw Rate Sensor (CAN-L) F47-13 (YAW) W Power Steering ECU (CAN-H) F47-4 (EPS) SB Power Steering ECU (CAN-L) F47-15 (EPS) W Combination Meter ECU (CAN-H) F47-7 (MET) G Combination Meter ECU (CAN-L) F47-18 (MET) W CAN Main wire (between D-CAN junction connector and P-CAN junction connector (CAN-H)) F47-11 (TOLH) Y CAN Main wire (between D-CAN junction connector and P-CAN junction connector (CAN-L)) F47-22 (TOLH) W Wiring diagram for identifying CAN Junction Connectors
DLC3 Turn the Ignition switch off. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F16-6 (CANH) - F16-14 (CANL) V - W Ignition switch off* 54 to 69 ohms F16-6 (CANH) - F16-4 (CG) V - W-B Ignition switch off* 200 ohms or higher F16-14 (CANL) - F16-4 (CG) W - W-B Ignition switch off* 200 ohms or higher F16-6 (CANH) - F16-16 (BAT) V - SB Ignition switch off* 6 kohms or higher F16-14 (CANL) - F16-16 (BAT) W - SB Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) Turn the Ignition switch off. Disconnect the A15 ABS and traction actuator (skid control ECU) connector. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition A15-25 (CANH) - A15-14 (CANL) G - W Ignition switch off* 54 to 69 ohms A15-25 (CANH) - A15-1 (GND1) G - W-B Ignition switch off* 200 ohms or higher A15-14 (CANL) - A15-1 (GND1) W - W-B Ignition switch off* 200 ohms or higher A15-25 (CANH) - A15-12 (+BS) G - W Ignition switch off* 6 kohms or higher A15-14 (CANL) - A15-12 (+BS) W - W Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
STEERING SENSOR Turn the Ignition switch off. Disconnect the F33 steering sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F33-3 (CANH) - F33-2 (CANL) SB - W Ignition switch off* 54 to 69 ohms F33-3 (CANH) - F33-1 (ESS) SB - W-B Ignition switch off* 200 ohms or higher F33-2 (CANL) - F33-1 (ESS) W - W-B Ignition switch off* 200 ohms or higher F33-3 (CANH) - F33-5 (BAT) SB - LG Ignition switch off* 6 kohms or higher F33-2 (CANL) - F33-5 (BAT) W - LG Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
YAW RATE SENSOR Turn the Ignition switch off. Disconnect the F34 yaw rate sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F34-3 (CANH) - F34-2 (CANL) BE - W Ignition switch off* 54 to 69 ohms F34-3 (CANH) - F34-1 (GND) BE - W-B Ignition switch off* 200 ohms or higher F34-2 (CANL) - F34-1 (GND) W - W-B Ignition switch off* 200 ohms or higher F34-3 (CANH) - F16-16 (BAT) BE - SB Ignition switch off* 6 kohms or higher F34-2 (CANL) - F16-16 (BAT) W - SB Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
AIR CONDITIONING AMPLIFIER Turn the Ignition switch off. Disconnect the G7 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition G7-2 (TX+) - G7-3 (TX-) V - W Ignition switch off* 54 to 69 ohms G7-2 (TX+) - G7-12 (GND) V - W-B Ignition switch off* 200 ohms or higher G7-3 (TX-) - G7-12 (GND) W - W-B Ignition switch off* 200 ohms or higher G7-2 (TX+) - F16-16 (BAT) V - SB Ignition switch off* 6 kohms or higher G7-3 (TX-) - F16-16 (BAT) W - SB Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
ECM Turn the Ignition switch off. Disconnect the A21 and C19 ECM connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition A21-41 (CANH) - A21-49 (CANL) L - W Ignition switch off* 108 to 132 ohms A21-41 (CANH) - C19-104 (E1) L - W Ignition switch off* 200 ohms or higher A21-49 (CANL) - C19-104 (E1) W - W Ignition switch off* 200 ohms or higher A21-41 (CANH) - A21-20 (BATT) L - Y Ignition switch off* 6 kohms or higher A21-49 (CANL) - A21-20 (BATT) W - Y Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
CENTER AIRBAG SENSOR ASSEMBLY Turn the Ignition switch off. Disconnect the F18 center airbag sensor assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F18-13 (CANH) - F18-22 (CANL) B - W Ignition switch off* 54 to 69 ohms F18-13 (CANH) - F18-25 (E1) B - W-B Ignition switch off* 200 ohms or higher F18-22 (CANL) - F18-25 (E1) W - W-B Ignition switch off* 200 ohms or higher F18-13 (CANH) - F16-16 (BAT) B - SB Ignition switch off* 6 kohms or higher F18-22 (CANL) - F16-16 (BAT) W - SB Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
POWER STEERING ECU Turn the Ignition switch off. Disconnect the A19 and F30 power steering ECU connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F30-1 (CANH) - F30-7 (CANL) SB - W Ignition switch off* 108 to 132 ohms F30-1 (CANH) - A19-2 (PGND) SB - W-B Ignition switch off* 200 ohms or higher F30-7 (CANL) - A19-2 (PGND) W - W-B Ignition switch off* 200 ohms or higher F30-1 (CANH) - A19-1 (PIG) SB - W Ignition switch off* 6 kohms or higher F30-7 (CANL) - A19-1 (PIG) W - W Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
COMBINATION METER ECU Turn the Ignition switch off. Disconnect the F1 and F2 combination meter assembly connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F2-15 (CANH) - F2-16 (CANL) G - W Ignition switch off* 54 to 69 ohms F2-15 (CANH) - F1-13 (ET) G - BR Ignition switch off* 200 ohms or higher F2-16 (CANL) - F1-13 (ET) W - BR Ignition switch off* 200 ohms or higher F2-15 (CANH) - F1-2 (ECUB) G - L Ignition switch off* 6 kohms or higher F2-16 (CANL) - F1-2 (ECUB) W - L Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
MAIN BODY ECU Turn the Ignition switch off. Disconnect the F38, 4B and 4E connectors. Measure the resistance according to the value(s) in the table below. Standard resistance Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition F38-23 (CANH) - F38-22 (CANL) R - W Ignition switch off* 54 to 69 ohms F38-23 (CANH) - 4E-17 (GND1) R - W-B Ignition switch off* 200 ohms or higher F38-22 (CANL) - 4E-17 (GND1) W - W-B Ignition switch off* 200 ohms or higher F38-23 (CANH) - 4B-30 (BECU) R - L Ignition switch off* 6 kohms or higher F38-22 (CANL) - 4B-30 (BECU) W - L Ignition switch off* 6 kohms or higher HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

FAIL-SAFE CHART

FAIL-SAFE FUNCTION When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning. The following table shows the relationships between components and system functions and effects of communication failure on these functions. (For further details, see the appropriate service information for each system.) Function ECM ABS and Traction Actuator (Skid Control ECU) Steering Sensor Yaw Rate Sensor Condition when communication impossible DTC detection (Driver detectable) VSC control (Controls driving force while VSC in operation) o • o o Control inoperative (gradually stops controlling during VSC control) Detectable (Light comes on) TRC control (Controls driving force and engine power when wheel slip detected during acceleration) o • o(*1) o(*1) Control inoperative (gradually stops controlling during TRC control) Detectable (Light comes on) Electric power steering (Outputs assist current) o o Steering force slightly increased at less than 70 km/h (43.5 mph) Steering force slightly reduced at 70 km/h (43.5 mph) or more Detectable (Light comes on) Event recorder (Tracks event data such as vehicle speed and accelerator opening angle and records data) o Data not recorded None Air conditioning control PTC heater control o Air conditioning function stops PTC heater function stops None (Air conditioning inoperative) Meter Display (Displays operation condition and DTCs) o o Light does not come on, illuminates abnormally, or blinks abnormally Detectable (Abnormal display) Buzzer control o o Buzzer function stops None (Light comes on) Illumination control Light illumination rheostat inoperative None (Rheostat inoperative) Power door lock control o Unlock permitted None (Wireless door lock cannot operate) HINT: •: Control master o: System related *1: When CAN communication failures occur in the steering sensor and the yaw rate sensors, the operations of VSC and TRC are prohibited. Function Power Steering ECU Center Airbag Sensor Assembly Air Conditioning Amplifier Combination Meter ECU Main Body ECU Condition when communication on impossible DTC detection (Driver detectable) VSC control (Controls driving force while VSC in operation) Control inoperative (gradually stops controlling during VSC control) Detectable (Light comes on) TRC control (Controls driving force and engine power when wheel slip detected during acceleration) Control inoperative (gradually stops controlling during TRC control) Detectable (Light comes on) Electric power steering (Outputs assist current) • Steering force slightly increased at less than 70 km/h (43.5 mph) Steering force slightly reduced at 43.5 mph (70 km/h) or more Detectable (Light comes on) Event recorder (Tracks event data such as vehicle speed and accelerator opening angle and records data) • o Data not recorded None Air conditioning control PTC heater control • o Air conditioning function stops PTC heater function stops None (Air conditioning inoperative) Meter Display (Displays operation condition and DTCs) o o • o Light does not come on, illuminates abnormally, or blinks abnormally Detectable (Abnormal display) Buzzer control o • o Buzzer function stops None (Light comes on) Illumination control o • Light illumination rheostat inoperative None (Rheostat inoperative) Power door lock control o • Unlock permitted None (Wireless door lock cannot operate) HINT: •: Control master o: System related

CAN Communication (Diagnostics): Other Scion xD I