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Contents Wiring diagrams Section: Communication Devices All sections

Networking: Other Toyota Corolla X

Communication Devices 22 illustrations ~2773 words

PRECAUTION

  1. PRECAUTIONS WHEN USING TECHSTREAM When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle, and turn the courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and the vehicle begins. After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG).
  2. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK If the steering lock ECU (steering lock actuator assembly) is replaced, open and close the driver door. The engine may not start until this is performed. HINT: Opening and closing the driver door causes the steering lock ECU (steering lock actuator assembly) to memorize the correct steering lock bar position.

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Scheme 132: PARTS LOCATION
Scheme 132: PARTS LOCATION

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Scheme 133: SYSTEM DIAGRAM
Scheme 133: SYSTEM DIAGRAM
  1. CERTIFICATION ECU BUS LINES

TERMINALS OF ECU

Note. Turn the ignition switch off before measuring the resistance of the CAN bus main wires and CAN bus branch wires. 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 any doors need to be opened in order to check the connectors, open the doors and leave them open.

HINT

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

Note. This section describes the standard CAN values for all CAN related components.

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Scheme 134: TERMINALS OF ECU
Scheme 134: TERMINALS OF ECU

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  1. JUNCTION CONNECTOR FOR CAN NO. 1 BUS CAN No. 1 junction connector CONNECTOR TERMINAL WIRING COLOR REFERENCE No. 1 Junction Connector Wiring Color Connect to E58-2 (CANH) G Combination meter E58-13 (CANL) W Combination meter E58-3 (CANH) SB Power steering ECU E58-14 (CANL) W Power steering ECU E58-4 (CANH) V Air conditioning amplifier E58-15 (CANL) W Air conditioning amplifier E58-5 (CANH) BR Steering angle sensor E58-16 (CANL) W Steering angle sensor E58-6 (CANH) L Yaw rate sensor E58-17 (CANL) W Yaw rate sensor E58-7 (CANH) LG DLC3 E58-18 (CANL) W DLC3 E58-8 (CANH) R Main body ECU E58-19 (CANL) W Main body ECU E58-9 (CANH) Y Center airbag sensor assembly E58-20 (CANL) W Center airbag sensor assembly E58-10 (CANH) B CAN No. 2 junction connector E58-21 (CANL) W CAN No. 2 junction connector E58-11 (CANH) GR Accessory gateway E58-22 (CANL) W Accessory gateway CAN No. 2 junction connector CONNECTOR TERMINAL WIRING COLOR REFERENCE No. 2 Junction Connector Wiring Color Connect to A47-8 (CANH) R Skid control ECU A47-19 (CANL) W Skid control ECU A47-9 (CANH) B CAN No. 1 junction connector A47-20 (CANL) W CAN No. 1 junction connector A47-10 (CANH) Y ECM A47-21 (CANL) W ECM The connection diagram of the components which are connected to the CAN junction connector
  2. JUNCTION CONNECTOR FOR CAN MS BUS CAN No. 3 junction connector CONNECTOR TERMINAL WIRING COLOR REFERENCE No. 3 Junction Connector Wiring Color Connect to E59-7 (CANH) SB Certification ECU E59-18 (CANL) W Certification ECU E59-8 (CANH) G Combination meter E59-19 (CANL) W Combination meter E59-9 (CANH) R Main body ECU E59-20 (CANL) W Main body ECU The connection diagram of the components which are connected to the CAN junction connector.
  3. DLC3 Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E11-6 (CANH) - E11-14 (CANL) LG-W Ignition switch off 54 to 69 ohms E11-6 (CANH) - E11-4 (CG) LG - W-B Ignition switch off 200 ohms or higher E11-14 (CANL) - E11-4 (CG) W-W-B Ignition switch off 200 ohms or higher E11-6 (CANH) - E11-16 (BAT) LG-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E11-14 (CANL) - E11-16 (BAT) W-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  4. SKID CONTROL ECU WITH ACTUATOR (w/o VSC) Disconnect the connector from the skid control ECU. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition A66-25 (CANH) - A66-14 (CANL) R-W Ignition switch off 54 to 69 ohms A66-25 (CANH) - A66-1 (GND1) R-W-B Ignition switch off 200 ohms or higher A66-14 (CANL) - A66-1 (GND1) W-W-B Ignition switch off 200 ohms or higher A66-25 (CANH) - A66-24 (+BM) R-L Cable Is disconnected from negative (-) battery terminal 6 kohms or higher A66-14 (CANL) - A66-24 (+BM) W-L Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  5. SKID CONTROL ECU WITH ACTUATOR (w/ VSC) Disconnect the connector from the skid control ECU. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition A51-25 (CANH) - A51-14 (CANL) R-W Ignition switch off 54 to 69 ohms A51-25 (CANH) - A51-1 (GND1) R-W-B Ignition switch off 200 ohms or higher A51-14 (CANL) - A51-1 (GND1) W-W-B Ignition switch off 200 ohms or higher A51-25 (CANH) - A51-24 (BM) R-L Cable is disconnected from negative (-) battery terminal 6 kohms or higher A51-14 (CANL) - A51-24 (BM) W-L Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  6. STEERING ANGLE SENSOR Disconnect the connector from the steering angle sensor. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E49-3 (CANH) - E49-2 (CANL) BR-W Ignition switch off 54 to 69 ohms E49-3 (CANH) - E49-1 (ESS) BR-BR Ignition switch off 200 ohms or higher E49-2 (CANL) - E49-1 (ESS) W-BR Ignition switch off 200 ohms or higher E49-3 (CANH) - E49-S (BAT) BR-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E49-2 (CANL) - E49-5 (BAT) W-W Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  7. YAW RATE SENSOR Disconnect the connector from the yaw rate sensor. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E97-3 (CANH) - E97-2 (CANL) L-W Ignition switch off 54 to 69 ohms E97-3 (CANH) - E97-1 (GND) L-BR Ignition switch off 200 ohms or higher E97-2 (CANL) - E97-1 (GND) W-BR Ignition switch off 200 ohms or higher E97-3 (CANH) - E11-16 (BAT) L-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E97-2 (CANL) - E11-16 (BAT) W-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  8. CENTER AIRBAG SENSOR Disconnect the connector from the center airbag sensor. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E14-13 (CANH) - E14-22 (CANL) Y-W Ignition switch off 54 to 69 ohms E14-13 (CANH) - E14-25 (E1) Y-W-B Ignition switch off 200 ohms or higher E14-22 (CANL) - E14-25 (E1) W-W-B Ignition switch off 200 ohms or higher E14-13 (CANH) - E11-16 (BAT) Y-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E14-22 (CANL) - E11-16 (BAT) W-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  9. ECM Disconnect the connector from the ECM. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition A50-41 (CANH) - A50-49 (CANL) Y-W Ignition switch off 108 to 132 ohms A50-41 (CANH) - B31-104 (E1) Y-BR Ignition switch off 200 ohms or higher A50-49 (CANL) - B31-104 (E1) W-BR Ignition switch off 200 ohms or higher A50-41 (CANH) - A50-20 (BATT) Y-P Cable is disconnected from negative (-) battery terminal 6 kohms or higher A50-49 (CANL) - A50-20 (BATT) W-P Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  10. AIR CONDITIONING AMPLIFIER (for Automatic Air Conditioning System) Disconnect the amplifier connector. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E30-11 (CANH) - E30-12 (CANL) V-W Ignition switch off 54 to 69 ohms E30-11 (CANH) - E30-14 (GND) V-BR Ignition switch off 200 ohms or higher E30-12 (CANL) - E30-14 (GND) W-BR Ignition switch off 200 ohms or higher E30-11 (CANH) - E30-21 (B) V-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E30-12 (CANL) - E30-21 (B) W-W Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  11. AIR CONDITIONING AMPLIFIER (for Manual Air Conditioning System) Disconnect the amplifier connector. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E63-8 (CANH) - E63-9 (CANL) V-W Ignition switch off 54 to 69 ohms E63-8 (CANH) - E63-24 (GND) V-BR Ignition switch off 200 ohms or higher E63-9 (CANL) - E63-24 (GND) W-BR Ignition switch off 200 ohms or higher E63-8 (CANH) - E11-16 (BAT) V-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E63-9 (CANL) - E11-16 (BAT) W-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  12. COMBINATION METER Disconnect the connector from the combination meter. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E46-27 (CANH) - E46-28 (CANL) G-W Ignition switch off 108 to 132 ohms E46-27 (CANH) - E46-30 (ET) G-BR Ignition switch off 200 ohms or higher E46-28 (CANL) - E46-30 (ET) W-BR Ignition switch off 200 ohms or higher E46-27 (CANH) - E46-32 (B) G-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E46-28 (CANL) - E46-32 (B) W-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E46-13 (TX-) - E46-14 (TX1-) W-G Ignition switch off 108 to 132 ohms E46-13 (TX-) - E46-30 (ET) G-BR Ignition switch off 200 ohms or higher E46-14 (TX1-) - E46-30 (ET) W-BR Ignition switch off 200 ohms or higher E46-13 (TX-) - E46-32 (B) G-W Cable is disconnected from negative (-) battery terminal 6 kohms or higher E46-14 (TX1-) - E46-32 (B) W-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  13. CERTIFICATION ECU Disconnect the connector from the certification ECU. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E36-27 (CANH) - E36-28 (CANL) SB-W Ignition switch off 54 to 69 ohms E36-27 (CANH) - E36-17 (E) SB - W-B Ignition switch off 200 ohms or higher E36-28 (CANL) - E36-17 (E) W-W-B Ignition switch off 200 ohms or higher E36-27 (CANH) - E36-1 (+B) SB-W Cable is disconnected from negative (-) battery terminal 6 kohms or higher E36-28 (CANL) - E36-1 (+B) W-W Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  14. MAIN BODY ECU (w/ Smart Key System or Automatic Light Control System) Disconnect the connector from the main body ECU. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E52-15 (CANH) - E52-16 (CANL) R-W Ignition switch off 54 to 69 ohms E52-15 (CANH) - E11-4 (CG) R-W-B Ignition switch off 200 ohms or higher E52-16 (CANL) - E11-4 (CG) W-W-B Ignition switch off 200 ohms or higher E52-15 (CANH) - E11-16 (BAT) R-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E52-16 (CANL) - E11-16 (BAT) W-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E51-11 (CANP) - E51-12 (CANN) R-W Ignition switch off 108 to 132 ohms E51-11 (CANP) - E11-4 (CG) R-W-B Ignition switch off 200 ohms or higher E51-12 (CANN) - E11-4 (CG) W-W-B Ignition switch off 200 ohms or higher E51-11 (CANP) - E11-16 (BAT) R-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher E51-12 (CANN) - E11-16 (BAT) W-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  15. MAIN BODY ECU (w/o Smart Key System, Automatic Light Control System) Disconnect the connector from the main body ECU. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E61-23 (CANH) - E61-22 (CANL) R-W Ignition switch off 54 to 69 ohms E61-23 (CANH) - E11-4 (CG) R-W-B Ignition switch off 200 ohms or higher E61-22 (CANL) - E11-4 (CG) W-W-B Ignition switch off 200 ohms or higher E61-23 (CANH) - E11-16 (BAT) R-G Cable Is disconnected from negative (-) battery terminal 6 kohms or higher E61-22 (CANL) - E11-16 (BAT) W-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher
  16. POWER STEERING ECU Disconnect the power steering ECU connectors. Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E32-1 (CANH) - E32-7 (CANL) SB-W Ignition switch off 54 to 69 ohms E32-1 (CANH) - A75-2 (PGND) SB-W-B Ignition switch off 200 ohms or higher E32-7 (CANL) - A75-2 (PGND) W-W-B Ignition switch off 200 ohms or higher E32-1 (CANH) - A75-1 (PIG) SB-L Cable is disconnected from negative (-) battery terminal 6 kohms or higher E32-7 (CANL) - A75-1 (PIG) W-L Cable Is disconnected from negative (-) battery terminal 6 kohms or higher
  17. ACCESSORY GATEWAY Measure the resistance according to the value (s) in the table below. Standard Resistance STANDARD RESISTANCE SPECIFICATION Terminal No. (Symbol) Wiring Color Condition Specified Condition E92-1 (CAN+) - E92-2 (CAN-) GR-W Ignition switch off 54 to 69 ohms E92-1 (CAN+) - E11-4 (CG) R-W-B Ignition switch off 200 ohms or higher E92-2 (CAN-) - E11-4 (CG) W-W-B Ignition switch off 200 ohms or higher E92-1 (CAN+) - E11-16 (BAT) R-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher E92-2 (CAN-) - E11-16 (BAT) W-G Cable is disconnected from negative (-) battery terminal 6 kohms or higher

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 pages for each system.) FAIL-SAFE FUNCTION CHART Function (Function Description) Control Master System Related Fall-safe Operation DTC (Driver Detectable) Air conditioning control Air Conditioning Amplifier ECM Combination Meter Main Body ECU Accessory Gateway Air conditioning function and DTC heater function stop B1499 (Air Conditioning inoperative) VSC control (1) (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 (Warning light comes on) VSC control (1) (Engine power control by VSC/TRC) Skid Control ECU ECM Steering Angle Sensor Yaw Rate Sensor VSC control is inoperative (VSC control gradually stops) U0073, U0100, U0123, U0124, U0126 (Warning light comes on) ABS control (Controls driving force while ABS in operation) Skid Control ECU Yaw Rate Sensor (1) Control inoperative (gradually stops controlling during ABS control) U0073, U0123 (1) , U0124 (1) (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 VSC Malfunction: Depression of EPS assist (Deterioration of steering) U0100, U0129 (VSC failure: Warning light comes on, and decrease of assistance power at vehicle speed 70 km/h) (ECM failure: Warning light comes on [only before assist beginning]) ECM Malfunction (before assist beginning): stop the assist operation ECM Malfunction (after assist beginning): continue the assist operation Entry function/Power door lock control (2) Main Body ECU ECM Center Airbag Sensor Assembly Combination Meter Certification ECU Unlock permitted U0327, U1002 (Wireless door lock cannot operate) Meter display (Displays operation condition and DTCs) Combination Meter ECM Skid Control ECU Power Steering ECU Center Airbag Sensor Assembly Air Conditioner Amplifier Certification ECU Main Body ECU Light does not come on, illuminates abnormally, or blinks abnormally U0100, U0129 (Abnormal light illumination) (1) w/VSC (2) w/ Smart key system

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