Toyota Tundra. Manual — part 286

2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

a. Disconnect the J2 main body ECU connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

Fig. 69: Identifying J2 Main Body ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (CANH,
CANL)

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY

GROUND)

a. Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the

main wire and the branch wire.

b. Disconnect the DA, DB and DD main body ECU connectors.

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

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 Specified Condition

J2-5 (CANH) - J2-6 (CANL) Ignition switch OFF

54 to 69 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Fig. 70: Identifying DA, DB And DD Main Body ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION TABLE

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

COMBINATION METER ECU COMMUNICATION STOP MODE

DESCRIPTION

SYMPTOM TABLE

Tester Connection

Condition Specified Condition

DD-62 (GND1) - Body ground Always

Below 1 ohms

Tester Connection

Condition Specified Condition

DA-1 (ALTB) - Body ground

Always

11 to 14 V

DB-13 (BECU) - Body ground

Detection Item

Symptom

Trouble Area

COMBINATION METER
ECU COMMUNICATION
STOP MODE

When either condition below is met:



Combination Meter is not displayed on
"CAN Bus Check".



Applies to "COMBINATION METER



Power source or
inside combination
meter ECU



Harness or
connector

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

WIRING DIAGRAM

Fig. 71: Identifying Combination Meter ECU Communication Stop Mode - 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. CHECK HARNESS AND CONNECTOR (COMBINATION METER ECU - BATTERY AND

BODY GROUND)

a. Disconnect the J28 combination meter ECU connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION TABLE

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

ECU COMMUNICATION STOP
MODE" in "DTC COMBINATION
TABLE".



Combination meter
ECU

Tester Connection

Condition Specified Condition

J28-40 (E1) - Body ground Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra

Standard voltage

STANDARD VOLTAGE SPECIFICATION TABLE

Fig. 72: Identifying J28 Combination Meter ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE COMBINATION METER ASSEMBLY (See REMOVAL )

CENTER AIRBAG SENSOR COMMUNICATION STOP MODE

DESCRIPTION

SYMPTOM TABLE

WIRING DIAGRAM

Tester Connection

Switch Condition Specified Condition

J28-18 (B) - Body ground

Always

11 to 14 V

J28-20 (IG+) - Body ground Ignition switch ON

Detection Item

Symptom

Trouble Area

CENTER AIRBAG SENSOR
COMMUNICATION STOP
MODE

When either condition below is met:



SRS Airbag is not displayed on "CAN Bus
Check".



Applies to "CENTER AIRBAG SENSOR
CONDITION COMMUNICATION STOP
MODE" in "DTC COMBINATION
TABLE".



Power source or
center airbag
sensor



Center airbag
sensor branch
wire or
connector



Center airbag
sensor

2009 Toyota Tundra

2009 ACCESSORIES & EQUIPMENT CAN Communication - Tundra