Toyota Tundra. Manual — part 289

Fig. 81: Identifying CAN Main Wire - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with
the CAN, which causes resistance variation.

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

a. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the

main wire and the branch wire.

CAUTION: Wait at least 90 seconds after disconnecting the cable from the

negative (-) battery terminal to prevent airbag and seat belt
pretensioner activation.

NOTE:

After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

2. CHECK DLC3

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

Result

RESULT REFERENCE TABLE

Fig. 82: Identifying J17 DLC3 Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

OK: Go to Next Step

3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

a. Disconnect the J94 No. 1 junction connector connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

Tester Connection

Switch Condition Measured Resistance Proceed to

J17-6 (CANH) - J17-14 (CANL) Ignition switch OFF

54 to 69 ohms

OK

69 ohms or higher

NG

NOTE:

When the measured value is 132 ohms or higher and a CAN
communication system DTC is output, there may be a problem
besides disconnection of the DLC3 branch wire. For that reason,
troubleshooting should be performed again from

HOW TO PROCEED

WITH TROUBLESHOOTING

after repairing the trouble area.

Tester Connection

Switch Condition Specified Condition

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 83: Identifying J94 No. 1 Junction Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 5

OK: Go to Next Step

4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR -

COMBINATION METER ECU)

a. Disconnect the J84 No. 1 junction connector connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

J94-1 (CANH) - J94-2 (CANL) Ignition switch OFF

108 to 132 ohms

Tester Connection

Switch Condition Specified Condition

J84-1 (CANH) - J84-2 (CANL) Ignition switch OFF

108 to 132 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 84: Identifying J84 No. 1 Junction Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 10

OK: REPLACE NO. 1 JUNCTION CONNECTOR

5. CONNECT CONNECTOR

a. Reconnect the J94 No. 1 junction connector connector.

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM)

a. Disconnect the J92 No. 2 junction connector connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Tester Connection

Switch Condition Specified Condition

J92-1 (CANH) - J92-2 (CANL) Ignition switch OFF

108 to 132 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra