B1266

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1266, B1267: Short to B+ in Instrument Panel System Communication Bus Malfunction
B1266 - Short to B+ in Instrument Panel System Communication Bus Malfunction
B1267 - Short to GND in Instrument Panel System Communication Bus Malfunction

DESCRIPTION

If a +B short circuit or body ground short circuit is detected on the instrument panel system communication bus (BEAN), the instrument panel system communication bus (BEAN) is disabled and a DTC code is output.





* *1: w/ Occupant Classification System

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (COMBINATION METER)

(a) Disconnect the J34 connector.





(b) Turn the engine switch on (IG).

(c) Clear the DTC.

(d) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

NG -- CHECK FOR DTC (A/C AMPLIFIER)

OK -- REPLACE COMBINATION METER Removal

2. CHECK FOR DTC (A/C AMPLIFIER)

(a) Reconnect the J34 connector.





(b) Disconnect the J58 connector.

(c) Turn the engine switch on (IG).

(d) Clear the DTC.

(e) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

(f) Proceed to next step based on the inspection result.

Result:





B -- CHECK HARNESS, CONNECTOR AND EACH ECU

C -- CHECK FOR DTC (CLEARANCE WARNING ECU)

A -- REPLACE A/C AMPLIFIER Removal

3. CHECK FOR DTC (CLEARANCE WARNING ECU)

(a) Reconnect the J58 connector.

(b) Disconnect the Q37 connector.





(c) Turn the engine switch on (IG).

(d) Clear the DTC.

(e) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

NG -- CHECK HARNESS, CONNECTOR AND EACH ECU

OK -- REPLACE CLEARANCE WARNING ECU Removal

4. CHECK HARNESS, CONNECTOR AND EACH ECU

(a) Disconnect the J34 and J58* connectors.





*: w/ Intuitive Parking Assist System

(b) Turn the engine switch on (IG).

(c) Clear the DTC.

(d) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

Result:





B -- CHECK FOR DTC (TIRE PRESSURE WARNING ECU AND RECEIVER)

C -- CHECK HARNESS AND CONNECTOR

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR (A/C AMPLIFIER - COMBINATION METER)

5. CHECK FOR DTC (TIRE PRESSURE WARNING ECU AND RECEIVER)

(a) Reconnect the J34 and J58 connectors.





(b) Disconnect the J49 connector.

(c) Turn the engine switch on (IG).

(d) Clear the DTC.

(e) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU AND RECEIVER)

OK -- REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Removal

6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU AND RECEIVER)

(a) Disconnect J34 connector.





(b) Turn the engine switch on (IG).

(c) Clear the DTC.

(d) Check for DTCs.

OK:

DTCs B1266 and B1267 are not output.

NG -- CHECK HARNESS AND CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU AND RECEIVER)

7. CHECK HARNESS AND CONNECTOR

(a) Disconnect the J76 connector.





(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:





Standard Resistance:





Result:





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - GATEWAY ECU)

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - GATEWAY ECU)
A -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - GATEWAY ECU)

(a) Reconnect the J49 connector.





(b) Disconnect the J58 connector.

(c) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (A/C AMPLIFIER - GATEWAY ECU)

OK -- REPLACE GATEWAY ECU