ECM Terminal Arrangement
WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
- Before measuring the resistance of CAN bus, turn the ignition OFF and leave the vehicle as is for at least one minute without operating keys, switches, and doors. Disconnect the auxiliary battery and wait for another one minute or more.
- After IG OFF, you may need to wait for some time before disconnecting the auxiliary battery terminal. Before starting the troubleshooting, refer to the procedure for disconnecting the auxiliary battery terminals. (Refer to WORKING PRECAUTIONS AND NOTES )
NOTE:
CAN communication system (ECM and sensor) may contain customized settings due to optional configuration. Before starting the procedure, make sure what type of systems (ECM and sensor) are implemented on the vehicle.
- Wiring harness connector (CAN J/C1)
- Wiring harness connector AN J/C1) (Instrument panel wire on right side of the vehicle) (Vbus)
ECM/sensor connection Terminal No. Wiring color Transmission control computer ASSY A17-5 B-W A17-16 L Skid control ECM (Brake actuator ASSY) [Vbus main line] A17-6 BR A17-17 B-R CAN No. junction connector [Vbus main line] A17-7 W-B A17-18 R-Y Power steering computer ASSY A17-8 B A17-19 W - Wiring harness connector (CAN J/C2)
- Wiring harness connector (CAN J/C2) (Instrument panel wire on left side of the vehicle) (Vbus)
ECM/sensor connection Terminal No. Wiring color CAN No. 1 junction connector [Vbus main line] D43-1 W-B D43-12 R-Y Combination meter ASSY D43-2 BR D43-13 BR-W Main body ECM (Multiplex network body computer) D43-3 P D43-14 LG Collation ECM (Smart key computer ASSY) D43-4 G D43-15 R Data link connector D43-5 B-Y D43-16 LG Spiral cable SUB-ASSY D43-6 G-W D43-17 G PSP (Accessory bus buffer) D43-7 P D43-18 L Airbag sensor ASSY D43-8 P-L D43-19 R-W Engine control computer [Vbus main line] D43-9 O D43-20 B-P Air conditioner amplifier ASSY D43-10 L-W D43-21 L-Y - Data link connector
- Inspection of data link connector (Vbus sub-line)
- Disconnect the battery ground terminal.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D10-6← →D10-14 Disconnection of the battery ground terminal 57 to 63 Ω D10-6← →GND Disconnection of the battery ground terminal 200 Ωor more D10-14← →GND Disconnection of the battery ground terminal 200 Ωor more D10-6< >+B Disconnection of the battery ground terminal 6 kΩ or more D10-14← →+B Disconnection of the battery ground terminal 6 kΩ or more - Inspection of data link connector (Vbus sub-line)
- Engine control computer
- Terminal arrangement
Terminal No. terminal symbol A33-19 - A33-18 - - Inspection of vehicle harness of engine control computer (Vbus main line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A33 from the engine control computer.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS MAIN LINEInspection terminals Inspection conditions Standard value A33-19← →A33-18 Disconnection of the battery ground terminal 114 to 126 Ω A33-19← →GND Disconnection of the battery ground terminal 200 Ωor more A33-18← →GND Disconnection of the battery ground terminal 200 Ωor more A33-19← →+B Disconnection of the battery ground terminal 6 kΩ or more A33-18← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Transmission control computer ASSY (Transmission A/T)
- Terminal arrangement
Terminal No. terminal symbol A18-29 - A18-28 - - Inspection of vehicle harness of transmission control computer ASSY (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A18 from the transmission control computer ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value A18-29← →A18-28 Disconnection of the battery ground terminal 57 to 63 Ω A18-29← →GND Disconnection of the battery ground terminal 200 Ωor more A18-28← →GND Disconnection of the battery ground terminal 200 Ωor more A18-29← →+B Disconnection of the battery ground terminal 6 kΩ or more A18-28← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Power steering computer ASSY
- Terminal arrangement
Terminal No. terminal symbol A15-1 - A15-7 - - Inspection of vehicle harness of power steering computer ASSY (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A15 from the power steering computer ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value A15-1← →A15-7 Disconnection of the battery ground terminal 57 to 63 Ω A15-1← →GND Disconnection of the battery ground terminal 200 Ωor more A15-7← →GND Disconnection of the battery ground terminal 200 Ωor more A15-1← →+B Disconnection of the battery ground terminal 6 kΩ or more A15-7← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Combination meter ASSY
- Terminal arrangement
Terminal No. terminal symbol D7-6 - D7-7 - - Inspection of vehicle harness of combination meter ASSY (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D7 from the combination meter ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D7-6← →D7-7 Disconnection of the battery ground terminal 57 to 63 Ω D7-6← →GND Disconnection of the battery ground terminal 200 Ωor more D7-7← →GND Disconnection of the battery ground terminal 200 Ωor more D7-6← →+B Disconnection of the battery ground terminal 6 kΩ or more D7-7← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Main body ECM (Multiplex network body computer)
- Terminal arrangement
Terminal No. terminal symbol D5-14 - D5-13 - - Inspection of vehicle harness of main body ECM (Multiplex network body computer) (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D5 from the main body ECM (Multiplex network body computer).
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D5-14← →D5-13 Disconnection of the battery ground terminal 57 to 63 Ω D5-14← →GND Disconnection of the battery ground terminal 200 Ωor more D5-13← →GND Disconnection of the battery ground terminal 200 Ωor more D5-14← →+B Disconnection of the battery ground terminal 6 kΩ or more D5-13← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Collation ECM (Smart key computer ASSY) (with smart entry)
- Terminal arrangement
Terminal No. terminal symbol D41-14 - D41-15 - - Inspection of vehicle harness of collation ECM (Smart key computer ASSY) (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D41 from the collation ECM (Smart key computer ASSY).
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D41-14← →D41-15 Disconnection of the battery ground terminal 57 to 63 Ω D41-14← →GND Disconnection of the battery ground terminal 200 Ωor more D41-15← →GND Disconnection of the battery ground terminal 200 Ωor more D41-14← →+B Disconnection of the battery ground terminal 6 kΩ or more D41-15← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Spiral cable SUB-ASSY (with sensor)
- Terminal arrangement
Terminal No. terminal symbol D56-3 - D56-2 - - Inspection of vehicle harness of spiral cable SUB-ASSY (with sensor) (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D56 from the spiral cable SUB-ASSY (with sensor).
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D56-3← →D56-2 Disconnection of the battery ground terminal 57 to 63 Ω D56-3← →GND Disconnection of the battery ground terminal 200 Ωor more D56-2← →GND Disconnection of the battery ground terminal 200 Ωor more D56-3← →+B Disconnection of the battery ground terminal 6 kΩ or more D56-2← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- PSP (Accessory bus buffer)
- Inspection of PSP (Accessory bus buffer) (Vbus sub-line)
- Disconnect the battery ground terminal.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D29-4← →D29-5 Disconnection of the battery ground terminal 57 to 63 Ω D29-4← →GND Disconnection of the battery ground terminal 200 Ωor more D29-5← →GND Disconnection of the battery ground terminal 200 Ωor more D29-4← →+B Disconnection of the battery ground terminal 6 kΩ or more D29-5← →+B Disconnection of the battery ground terminal 6 kΩ or more - Inspection of PSP (Accessory bus buffer) (Vbus sub-line)
- Airbag sensor ASSY
- Terminal arrangement
Terminal No. terminal symbol D27-13 - D27-22 - - Inspection of vehicle harness of airbag sensor ASSY (Vbus subline)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D27 from the airbag sensor ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D27-13← →D27-22 Disconnection of the battery ground terminal 57 to 63 Ω D27-13← →GND Disconnection of the battery ground terminal 200 Ωor more D27-22← →GND Disconnection of the battery ground terminal 200 Ωor more D27-13← →+B Disconnection of the battery ground terminal 6 kΩ or more D27-22← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Air conditioner amplifier ASSY (Automatic air conditioning system)
- Terminal arrangement
Terminal No. terminal symbol D19-13 - D19-12 - - Inspection of vehicle harness of air conditioner amplifier ASSY (Vbus sub-line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D19 from the air conditioner amplifier ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS SUB-LINEInspection terminals Inspection conditions Standard value D19-13← →D19-12 Disconnection of the battery ground terminal 57 to 63 Ω D19-13← →GND Disconnection of the battery ground terminal 200 Ωor more D19-12← →GND Disconnection of the battery ground terminal 200 Ωor more D19-13← →+B Disconnection of the battery ground terminal 6 kΩ or more D19-12← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement
- Brake actuator ASSY
- Terminal arrangement
Terminal No. terminal symbol A5-26 - A5-14 - - Inspection of vehicle harness of brake actuator ASSY (Vbus main line)
- Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A5 from the brake actuator ASSY.
- Measure the resistance between the terminals.
Resistance
STANDARD VALUE SPECIFICATION - VBUS MAIN LINEInspection terminals Inspection conditions Standard value A5-26← →A5-14 Disconnection of the battery ground terminal 114 to 126 Ω A5-26← →GND Disconnection of the battery ground terminal 200 Ωor more A5-14← →GND Disconnection of the battery ground terminal 200 Ωor more A5-26← →+B Disconnection of the battery ground terminal 6 kΩ or more A5-14← →+B Disconnection of the battery ground terminal 6 kΩ or more - Terminal arrangement