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.
Open in Bus 4 Main Bus Line [11/2018 - 02/2019]: Procedure
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR)
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Disconnect the No. 1 CAN junction connector.
*a Front view of wire harness connector
(to No. 1 CAN Junction Connector)*b to No. 4 CAN Junction Connector *c to No. 6 CAN Junction Connector - - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Connected to G96-9 (CANH) - G96-20 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 4 CAN junction connector G96-10 (CANH) - G96-21 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 6 CAN junction connector Result
Result Proceed to OK A NG (No. 6 CAN junction connector CAN main wire) B NG (No. 4 CAN junction connector CAN main wire) C
Result:
A
REPLACE NO. 1 CAN JUNCTION CONNECTOR
Result:
C
See step 3
Result:
B
See step 2
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR)
- Reconnect the G96 No. 1 CAN junction connector.
- Disconnect the No. 6 CAN junction connector.
*a Front view of wire harness connector
(to No. 6 CAN Junction Connector)*b to Central Gateway ECU (Network Gateway ECU) *c to No. 1 CAN Junction Connector - - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Connected to M31-3 (CANH) - M31-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU) M31-4 (CANH) - M31-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector Result
Result Proceed to OK A NG (Central gateway ECU [network gateway ECU] CAN main wire) B NG (No. 1 CAN junction connector CAN main wire) C
Result:
A
REPLACE NO. 6 CAN JUNCTION CONNECTOR
Result:
B
See step 4
Result:
C
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)
- Reconnect the G96 No. 1 CAN junction connector.
- Disconnect the No. 4 CAN junction connector.
*a Front view of wire harness connector
(to No. 4 CAN Junction Connector)*b to Airbag ECU Assembly *c to No. 1 CAN Junction Connector *d - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Connected to G104-2 (CANH) - G104-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Airbag ECU assembly G104-4 (CANH) - G104-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector Result
Result Proceed to OK A NG (Airbag ECU assembly CAN main wire) B NG (No. 1 CAN junction connector CAN main wire) C
Result:
A
REPLACE NO. 4 CAN JUNCTION CONNECTOR
Result:
B
See step 5
Result:
C
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)
- CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)
- Reconnect the M31 No. 6 CAN junction connector.
- Disconnect the central gateway ECU (network gateway ECU) connector.
*a Front view of wire harness connector
(to Central Gateway ECU [Network Gateway ECU]) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G72-22 (CA2H) - G72-7 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result
Proceed to OK NG
Result:
OK
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)
Refer to REMOVAL [11/2018 - 02/2019]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)
- CHECK FOR OPEN IN CAN BUS WIRE (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)
- Reconnect the G104 No. 4 CAN junction connector.
- Disconnect the airbag ECU assembly connector.
*a Front view of wire harness connector
(to Airbag ECU Assembly)Refer to PRECAUTION [11/2018 - 08/2020]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G70-26 (CANH) - G70-27 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result
Proceed to OK NG
Result:
OK
REPLACE AIRBAG ECU ASSEMBLY
Refer to REMOVAL [11/2018 - 02/2019]
Result:
NG
REPLACE CAN MAIN WIRE AND CONNECTOR (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)
NO RELATED
Use the Manual With the Right Hardware
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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.