Inspection Procedure

NOTE:

Turn the engine switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
After the engine 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 engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT.

Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change

CHECK DTC

Check for DTCs.

HINT:

If CAN MS bus communication error DTC B2326 is output, troubleshoot for B2326 and check for malfunctions in the CAN MS main bus circuit (See DTC B2326 CAN MS BUS LINE COMMUNICATION MALFUNCTION ).

Result

RESULT REFERENCE

Result	Proceed to
B2326 is not output	A
B2326 is output	B

B: GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next step

CHECK CAN MS BUS WIRE (OUTER MIRROR CONTROL ECU)

Turn the engine switch off
Disconnect connector E65 from the outer mirror control ECU.

Measure the resistance according to the value(s) in the table below

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Value
E65-1 (CANH) - E65-21 (CANL)	Engine switch OFF	54 to 69 Ω

Fig 1: Identifying Outer Mirror Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (OUTER MIRROR CONTROL ECU)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ACC, GND)

Disconnect connector E66 from the outer mirror control ECU.

Measure the resistance according to the value(s) in the table below

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Value
E66-9 (GND) - Body ground	Always	Below 1 Ω

Measure the voltage according to the value(s) in the table below

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Value
E66-4 (ACC) - Body ground	Engine switch on (ACC)	10 to 14 V

Fig 2: Identifying Outer Mirror Control ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE OUTER MIRROR CONTROL ECU (See REMOVAL )