CAN Communication: Other Scion xB II

RESULT LIST OF CHECK CAN BUS LINE

PROBLEM SYMPTOMS CHART

COMMUNICATION STOP MODE TABLE

COMMUNICATION STOP MODE REFERENCE

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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1. JUNCTION CONNECTOR CAN Center Junction Connector Wiring color CONNECTOR COLOR SPECIFICATION CAN center junction connectors Terminals No. (Symbols) Color Steering sensor (CAN-H) C48-5 (CANH) BR Steering sensor (CAN-L) C48-16 (CANL) W DLC 3 (CAN-H) C48-7 (CANH) LG DLC 3 (CAN-L) C48-18 (CANL) W Air conditioning amplifier (CAN-H) C48-4 (CANH) V Air conditioning amplifier (CAN-L) C48-15(CANL) W Center airbag sensor assembly (CAN-H) C48-9 (CANH) Y Center airbag sensor assembly (CAN-L) C48-21 (CANL) W CAN Main wire (between CAN center junction connector and CAN LH junction connector (CAN-H)) C48-10 (CANH) B CAN Main wire (between CAN center junction connector and CAN LH junction connector (CAN-L)) C48-21 (CANL) W Yaw Rate Sensor (CAN-H) C48-6 (CANH) L Yaw Rate Sensor (CAN-L) C48-17 (CANL) W Combination Meter ECU (CAN-H) C48-2 (CANH) G Combination Meter ECU (CAN-L) C48-13(CANL) W Power Steering ECU (CAN-H) C48-3 (CANH) SB Power Steering ECU (CAN-L) C48-14 (CANL) W Main Body ECU (CAN-HI C48-8 (CANH) R Main Body ECU (CAN-L) C48-19 (CANL) W Bus Buffer (CAN-H) C48-1 (H) P Bus Buffer (CAN-L) C48-12(L) W CAN LH Junction Connector Wiring color CONNECTOR COLOR SPECIFICATION CAN LH junction connectors Terminals No. (Symbols) Color ABS and traction actuator (skid control ECU) (CAN-H) A33-8 (CANH) R ABS and traction actuator (skid control ECU) (CAN-L) A33-19 (CANL) W ECM (CAN-H) A33-10 (CANH) Y ECM (CAN-L) A33-21 (CANH) W CAN Main wire (between CAN LH junction connector and CAN center junction connector (CAN-H)) A33-9 (CANH) B CAN Main wire (between CAN LH junction connector and CAN center junction connector (CAN-L)) A33-20 (CANL) W Wiring diagram for identifying CAN Junction Connectors
2. DLC3 Turn the ignition switch off. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C14-6 (CANH) - C14-14 (CANL) LG - W Ignition switch off 54 to 69 ohms C14-6 (CANH) - C14-4 (CG) LG - W-B Ignition switch off 200 ohms or higher C14-14 (CANL) - C14-4 (CG) W - W-B Ignition switch off 200 ohms or higher C14-6 (CANH) - C14-16 (BAT) LG - G Ignition switch off 6 kohms or higher C14-14 (CANL) - C14-16 (BAT) W - G Ignition switch off 6 kohms or higher
3. ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) Turn the ignition switch off. Disconnect the A37 ABS and traction actuator (skid control ECU) connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition A37-25 (CANH) - A37-14 (CANL) R - W Ignition switch off 54 to 69 ohms A37-25 (CANH) - A37-1 (GND1) R - W-B Ignition switch off 200 ohms or higher A37-14 (CANL) - A37-1 (GND1) W - W-B Ignition switch off 200 ohms or higher A37-25 (CANH) - A37-12 (+BS) R - W Ignition switch off 6 kohms or higher A37-14 (CANL) - A37-12 (+BS) W - W Ignition switch off 6 kohms or higher
4. STEERING SENSOR Turn the ignition switch off. Disconnect the C44 steering sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C44-3 (CANH) - C44-2 (CANL) BR - W Ignition switch off 54 to 69 ohms C44-3 (CANH) - C44-1 (ESS) BR - BR Ignition switch off 200 ohms or higher C44-2 (CANL) - C44-1 (ESS) W - BR Ignition switch off 200 ohms or higher C44-3 (CANH) - C44-5 (BAT) BR - W Ignition switch off 6 kohms or higher C44-2 (CANL) - C44-5 (BAT) W - W Ignition switch off 6 kohms or higher
5. YAW RATE SENSOR Turn the ignition switch off. Disconnect the C43 yaw rate sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C43-3 (CANH) - C43-2 (CANL) L - W Ignition switch off 54 to 69 ohms C43-3 (CANH) - C43-1 (GND) L - BR Ignition switch off 200 ohms or higher C43-2 (CANL) - C43-1 (GND) W - BR Ignition switch off 200 ohms or higher C43-3 (CANH) - C14-16 (BAT) L - G Ignition switch off 6 kohms or higher C43-2 (CANL) - C14-16 (BAT) W - G Ignition switch off 6 kohms or higher
6. AIR CONDITIONING AMPLIFIER Turn the ignition switch off. Disconnect the C8 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C8-2 (CANH) - C8-3 (CANL) V - W Ignition switch off 54 to 69 ohms C8-2(CANH)-C8-12(GND) V - W-B Ignition switch off 200 ohms or higher C8-3 (CANL) - C8-12 (GND) W - W-B Ignition switch off 200 ohms or higher C8-2 (CANH) - C14-16 (BAT) V - G Ignition switch off 6 kohms or higher C8-3 (CANL) - C14-16 (BAT) W - G Ignition switch off 6 kohms or higher
7. ECM Turn the ignition switch off. Disconnect the A36 and B33 ECM connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition A36-41 (CANH) - A36-49 (CANL) Y - W Ignition switch off 108 to 132 ohms A36-41 (CANH) - B33-104 (E1) Y - BR Ignition switch off 200 ohms or higher A36-49 (CANL) - B33-104 (E1) W - BR Ignition switch off 200 ohms or higher A36-41 (CANH) - A36-20 (BATT) Y - P Ignition switch off 6 kohms or higher A36-49 (CANL) - A36-20 (BATT) W - P Ignition switch off 6 kohms or higher
8. CENTER AIRBAG SENSOR ASSEMBLY Turn the ignition switch off. Disconnect the C17 center airbag sensor assembly connector Measure the resistance according to the value(s) in the table below Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C17-13 (CANH) - C17-22 (CANL) Y - W Ignition switch off 54 to 69 ohms C17-13 (CANH) - C17-25 (E1) Y - W-B Ignition switch off 200 ohms or higher C17-22 (CANL) - C17-25 (E1) W - W-B Ignition switch off 200 ohms or higher C17-13 (CANH) - C14-16 (BAT) Y - G Ignition switch off 6 kohms or higher C17-22 (CANL) - C14-16 (BAT) W - G Ignition switch off 6 kohms or higher
9. POWER STEERING ECU Turn the ignition switch off. Disconnect the A24 and C34 power steering ECU connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C34-1 (CANH) - C34-7 (CANL) SB - W Ignition switch off 54 to 69 ohms C34-1 (CANH) - A24-2 (PGND) SB - W-B Ignition switch off 200 ohms or higher C34-7 (CANL) - A24-2 (PGND) W - W-B Ignition switch off 200 ohms or higher C34-1 (CANH) - A24-1 (PIG) SB - L Ignition switch off 6 kohms or higher C34-7 (CANL) - A24-1 (PIG) W - L Ignition switch off 6 kohms or higher
10. COMBINATION METER ECU Turn the ignition switch off. Disconnect the C37 combination meter assembly connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C37-11 (CANH) - C37-12 (CANL) G - W Ignition switch off 108 to 132 ohms C37-11 (CANH) - C37-24 (ET) G - BR Ignition switch off 200 ohms or higher C37-12 (CANL) - C37-24 (ET) W - BR Ignition switch off 200 ohms or higher C37-11 (CANH)-C37-1 (B) G - W Ignition switch off 6 kohms or higher C37-12 (CANL)-C37-1 (B) W - W Ignition switch off 6 kohms or higher
11. BUS BUFFER ECU Turn the ignition switch off. Disconnect the C26 bus buffer connector. HINT: For vehicles without Accessory, take the connector out for inspection. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C26-1 (CAN+) - C26-2 (CAN-) P - W Ignition switch off 54 to 69 ohms C26-1 (CAN+) - C14-4 (CG) P - W-B Ignition switch off 200 ohms or higher C26-2 (CAN-) - C14-4 (CG) W - W-B Ignition switch off 200 ohms or higher C26-1 (CAN+) - C14-16 (BAT) P - G Ignition switch off 6 kohms or higher C26-2 (CAN-) - C14-16 (BAT) W - G Ignition switch off 6 kohms or higher
12. MAIN BODY ECU Turn the ignition switch off. Disconnect the C45, 2B and 2E connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Terminals No. (Symbols) Wiring Color Switch Condition Specified Condition C45-23 (CANH) - C45-22 (CANL) R - W Ignition switch off 54 to 69 a C45-23 (CANH) - 2E-17 (GND1) R - W-B Ignition switch off 200 ohms or higher C45-22 (CANL) - 2E-17 (GND1) W - W-B Ignition switch off 200 ohms or higher C45-23 (CANH) - 2B-30 (ECUB) R - W Ignition switch off 6 kohms or higher C45-22 (CANL) - 2B-30 (ECUB) W - W Ignition switch off 6 kohms or higher

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1. BUS CHECK (COMMUNICATION MALFUNCTION DTC) HINT: Only CAN communication system DTCs for each ECU can be displayed on the intelligent tester or Techstream. Select "Bus Check" from the "System Select" screen on the intelligent tester or Techstream. Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter". Select the system of the DTC to be checked and select "Details". CAN communication system DTCs are displayed.
2. BUS CHECK (COMMUNICATION BUS CHECK) HINT: The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester or Techstream. Select "Communication Bus Check" from the "Bus Check" screen. The screen displays the ECUs and sensors that are properly connected to the CAN communication system. HINT: If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system (See «PROBLEM SYMPTOMS TABLE»(ref-289774-S16123615552008070700000) ). Display the communication BUS check screen for approximately 1 minute and check for ECUs and sensors that are not indicated on the screen. "There is no system connected to the communication bus" is displayed if there are no ECUs or sensors connected to the CAN bus.
3. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT ADOPT CAN COMMUNICATION Systems (ECUs and sensors) that adopt CAN communication vary depending on the vehicle's optional settings. Check which systems (ECUs and sensors) are installed on the vehicle. ECU AND SENSOR SPECIFICATION ECU/Sensor name Check method ABS and traction actuator (skid control ECU) Installed on all vehicles Steering sensor Installed on all vehicles Yaw rate sensor Installed on all vehicles ECM Installed on all vehicles Center airbag sensor assembly Installed on all vehicles Air conditioning amplifier Installed on all vehicles Combination meter ECU Installed on all vehicles Main body ECU Installed on all vehicles Bus buffer ECU With Accessory
4. DTC TABLE BY ECU HINT: In the CAN communication system, CAN communication system DTCs output by the ECU can be displayed by using an intelligent tester or Techstream. If CAN communication system DTCs are output, trouble cannot be determined solely from the DTCs. Perform troubleshooting according to " «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-289774-S18598209542008070700000) " . ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) HINT: DTC communication uses the CAN communication system. ABS AND TRACTION ACTUATOR - DTC REFERENCE DTC No. Detection Item U0073/94 Control Module Communication Bus OFF U0100/65 Lost Communication with ECM/PCM "A" U0123/62 Lost Communication with Yaw Rate Sensor Module U0124/95 Lost Communication with Lateral Acceleration Sensor Module U0126/63 Lost Communication with Steering Angle Sensor Module POWER STEERING ECU HINT: DTC communication uses the SIL line. POWER STEERING ECU - DTC REFERENCE DTC No. Detection Item U0100 Lost Communication with ECM/PCM "A" U0129 Lost Communication with Skid Control ECU COMBINATION METER ECU HINT DTC communication uses the CAN communication system. COMBINATION METER ECU - DTC REFERENCE DTC No. Detection Item U0100 Lost Communication with ECM/PCM "A" U0129 Lost Communication with Skid Control ECU AIR CONDITIONING AMPLIFIER HINT: DTC communication uses the CAN communication system. This DTC is output when the CAN communication system is malfunctioning and is not stored as a past DTC. AIR CONDITIONING AMPLIFIER - DTC REFERENCE DTC No. Detection Item B1499 Multiplex Communication Circuit ECM HINT: DTC communication uses the CAN communication system. AIR CONDITIONING AMPLIFIER - DTC REFERENCE DTC No. Detection Item U0100 Lost Communication with ECM/PCM "A" U0122 Lost Communication with Vehicle Dynamics Control Module U0123 Lost Communication with Yaw Rate Sensor Module U0126 Lost Communication with Steering Angle Sensor Module U0129 Lost Communication with Skid Control ECU CENTER AIRBAG SENSOR ASSEMBLY HINT. The center airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not output. If "SRS Airbag" is not displayed on the "Communication Bus Check" screen on the intelligent tester or Techstream, proceed to " «CENTER AIRBAG SENSOR COMMUNICATION STOP MODE.»(ref-289774-S20174744612008070700000) " MAIN BODY ECU HINT: The main body ECU is connected to the CAN communication system but CAN communication DTCs are not output. If "Integrated J/B" is not displayed on the "Communication Bus Check" screen on the intelligent tester or Techstream, proceed to " «MAIN BODY ECU COMMUNICATION STOP MODE.»(ref-289774-S09408196612008070700000) " BUS BUFFER ECU HINT: The bus buffer ECU is connected to the CAN communication system but CAN communication DTCs are not output. If "Accessory Gateway" is not displayed on the "Communication Bus Check" screen on the intelligent tester or Techstream, proceed to " «BUS BUFFER ECU COMMUNICATION STOP MODE.»(ref-289774-S14634169682008070700000) "
5. DTC COMBINATION TABLE DTC COMBINATION CHART DTC Trouble Mode Output from Output DTC ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode Power Steering ECU Communication Stop Mode Steering Angle Sensor Communication Stop Mode Yaw Rate Sensor Communication Stop Mode Center Airbag Sensor Communication Stop Mode ABS and Traction Actuator (Skid Control ECU) U0073/94 o (*) X X X X U0100/65 o (*) X X X X U0123/62 o (*) X X o X U0124/95 o (*) X X o X U0126/63 o (*) X o X X Power Steering ECU U0100 X o (*) X X X U0129 o o (*) X X X Combination Meter ECU U0100 X X X X X U0129 o X X X X ECM U0100 X X X X X U0122 o X X X X U0123 X X X o X U0126 X X o X X U0129 o X X X X HINT: o: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens *: This DTC cannot be output when CAN communication is suspended. DTC COMBINATION CHART DTC Trouble Mode Output from Output DTC ECM Communication Stop Mode Air Conditioning Amplifier Communication Stop Mode Combination Meter ECU Communication Stop Mode Main Body ECU Communication Stop Mode Bus Buffer ECU Communication Stop Mode ABS and Traction Actuator (Skid Control ECU) U0073/94 X X X X X U0100/65 o X X X X U0123/62 X X X X X U0124/95 X X X X X U0126/63 X X X X X Power Steering ECU U0100 o X X X X U0129 X X X X X Combination Meter ECU U0100 o X o (*) X X U0129 X X o (*) X X ECM U0100 o (*) X X X X U0122 o (*) X X X X U0123 o (*) X X X X U0126 o (*) X X X X U0129 o (*) X X X X HINT: o: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens *: This DTC cannot be output when CAN communication is suspended. Perform troubleshooting according to the combination of DTCs output. ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode: (See «ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) COMMUNICATION STOP MODE»(ref-289774-S18048988862008070700000) ) Power Steering ECU Communication Stop Mode: (See «POWER STEERING ECU COMMUNICATION STOP MODE»(ref-289774-S36672990002008070700000) ) Steering Angle Sensor Communication Stop Mode: (See «STEERING ANGLE SENSOR COMMUNICATION STOP MODE»(ref-289774-S00842382082008070700000) ) Yaw Rate Sensor Communication Stop Mode: (See «YAW RATE SENSOR COMMUNICATION STOP MODE»(ref-289774-S10489000092008070700000) ) ECM Communication Stop Mode: (See «ECM COMMUNICATION STOP MODE»(ref-289774-S22007576862008070700000) ) Center Airbag Sensor Communication Stop Mode: (See «CENTER AIRBAG SENSOR COMMUNICATION STOP MODE»(ref-289774-S20174744612008070700000) ) Air Conditioning Amplifier Communication Stop Mode: (See «AIR CONDITIONING AMPLIFIER COMMUNICATION STOP MODE»(ref-289774-S01045874562008070700000) ) Combination Meter ECU Communication Stop Mode: (See «COMBINATION METER ECU COMMUNICATION STOP MODE»(ref-289774-S25806526432008070700000) ) Main Body ECU Communication Stop Mode: (See «MAIN BODY ECU COMMUNICATION STOP MODE»(ref-289774-S09408196612008070700000) ) Bus Buffer ECU Communication Stop Mode: (See «BUS BUFFER ECU COMMUNICATION STOP MODE»(ref-289774-S14634169682008070700000) )

FAIL-SAFE CHART

1. FAIL-SAFE FUNCTION When communication fails in any of the CAN bus wires (communication wires) 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 chart shows the relationships between components, system functions, and effects of communication failure on these functions. (For further details, see the information for each system.) FAIL-SAFE FUNCTION CHART Function (Function Description) Control Master System Related Fail-safe Operation DTC (Driver Detectable) VSC control (Controls driving force while VSC in operation) Skid Control ECU ECM Steering Angle Sensor Yaw Rate Sensor VSC control is inoperative (VSC control gradually stops) U0073, U0100, U0123, U0124, U0126, U0129 (Warning Light comes on) TRC control (Engine power control by VSC/TRC) Skid Control ECU ECM Steering Angle Sensor Yaw Rate Sensor TRC control is inoperative (TRC control gradually stops) U0073, U0100, U0123, U0124, U0126, U0129 (Warning Light comes on) ABS control (Control driving force while ABS in operation) Skid Control ECU Yaw Rate Sensor Control inoperative (gradually stops controlling during ABS control) U0073, U0123, U0124, C0371 (Warning light comes on) Electric power steering (Speed of vehicle induction type torque control) Power Steering ECU ECM Skid Control ECU Steering Angle Sensor Combination Meter Stopping or depression of EPS assist (Deterioration of steering) U0100, U0129 (VSC failure warning light comes on) (ECM failure Assist stopping/decrease of assist) Meter display (Vehicle status display and indicator light control) Combination Meter ECM Skid Control ECU Power Steering ECU Accessory Bus Buffer Center Airbag Sensor Assembly Air Conditioning Amplifier Main Body ECU Always turning on the light or always turning off the light U0100, U0129 (Abnormal light illumination) Air conditioning control Air Conditioning Amplifier ECM Accessory Bus Buffer Combination Meter Main Body ECU Air conditioning function stop B1499 (Air Conditioning inoperative) Neutral control ECM Skid Control ECU Neutral control stops U0129 (Not detectable)