Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Main Body ECU Communication Stop Mode [06/2016 - ]: Procedure
- CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU (NETWORK GATEWAY ECU) BRANCH LINE)
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the D5 main body ECU (network gateway ECU) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D5-14 (CANH) - D5-13 (CANL) Cable disconnected from negative (-) battery terminal 57 to 63 Ω TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Main Body ECU (Network Gateway ECU))
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MAIN BODY ECU (NETWORK GATEWAY ECU))
Result:
OK
See step 2
- CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- Remove the main body ECU (network gateway ECU) (Refer to REMOVAL [06/2016 - ] ).
- Remove the instrument panel junction block assembly (Refer to REMOVAL [06/2016 - ]
).TEXT IN ILLUSTRATION
*a Component without harness connected
(Instrument Panel Junction Block Assembly)- - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3E-1 - MB-8 (IG) Battery voltage is applied to terminals 3A-15 and 3A-12 Below 1 Ω MB-1 (BECU) - 3A-27 Always Below 1 Ω MB-11 (GND) - 3B-18 Always Below 1 Ω MB-32 (BMPX) - 3C-19 Always Below 1 Ω
Result:
NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(Refer to REMOVAL [06/2016 - ] )
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
- Install the instrument panel junction block assembly.TEXT IN ILLUSTRATION
*a Component without harness connected
(Instrument Panel Junction Block Assembly)*b Front view of wire harness connector
(to Instrument Panel Junction Block Assembly) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D6-1 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω MB-11 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω - Connect the cable to the negative (-) battery terminal.TEXT IN ILLUSTRATION
*a Component without harness connected
(Instrument Panel Junction Block Assembly)- - - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition MB-1 (BECU) - Body ground Ignition switch off 11 to 14 V MB-8 (IG) - Body ground Ignition switch ON 11 to 14 V MB-32 (BMPX) - Body ground Ignition switch off 11 to 14 V
Result:
OK
REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU)
(Refer to REMOVAL [06/2016 - ] )
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Install the instrument panel junction block assembly.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.