Toyota Tundra Service Manual: Cargo Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a cargo light information signal from the deck light switch assembly and door courtesy light switch, and illuminates the cargo light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and bulbs for circuits related to this system before performing the following procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Using the Techstream, perform the Active Test.

Click here

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Cargo Light

Cargo light

OFF or ON

Deck light switch assembly is DOOR or on position.

OK:

Cargo light turns on / turns off.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

Main Body

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Deck light switch assembly

Deck light switch assembly signal / OFF or ON

OFF: Deck light switch assembly off

ON: Deck light switch assembly on

-

OK:

Normal condition listed above are displayed.

NG

GO TO STEP 9

OK

3.

CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT SOCKET AND WIRE - BATTERY)

(a) Disconnect the center stop light socket and wire connector.

*a

Front view of wire harness connector

(to Center Stop Light Socket and Wire)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P8-3 (DL) - Body ground

Deck light switch assembly on

11 to 14 V

Deck light switch assembly DOOR, door is open

11 to 14 V

Deck light switch assembly off

Below 1 V

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

4.

CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT SOCKET AND WIRE - BODY GROUND)

(a) Disconnect the center stop light socket and wire connector.

*a

Front view of wire harness connector

(to Center Stop Light Socket and Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P8-1 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT DECK LIGHT SWITCH ASSEMBLY

(a) Remove the deck light switch assembly.

Click here

(b) Inspect the deck light switch assembly.

Click here

NG

REPLACE DECK LIGHT SWITCH ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BATTERY)

(a) Disconnect the driver side junction block assembly connector.

*a

Front view of wire harness connector

(to Driver Side Junction Block Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3H-7 - Body ground

Always

11 to 14 V

3H-30 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - CENTER STOP LIGHT SOCKET AND WIRE AND DECK LIGHT SWITCH ASSEMBLY)

(a) Disconnect the 3J and 3K driver side junction block assembly connectors.

(b) Disconnect the P8 center stop light socket and wire connector.

(c) Disconnect the J50 deck light switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3K-28 - P8-3 (DL)

Always

Below 1 Ω

3J-19 - J50-5 (CCTY)

Always

Below 1 Ω

3I-28 - J50-9 (CGON)

Always

Below 1 Ω

3K-28 or P8-3 (DL) - Body ground

Always

10 kΩ or higher

3J-19 or J50-5 (CCTY) - Body ground

Always

10 kΩ or higher

3I-28 or J50-9 (CGON) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

Click here

*a

Component without harness connected

(Driver Side Junction Block Assembly)

-

-

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3K-28 - 3H-7

Battery positive (+) → 3H-30

Battery negative (-) → 3J-19

Below 1 Ω

Battery not connected to 3J-19 and 3H-30

10 kΩ or higher

3I-28 - A-27 (RFGO)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

9.

INSPECT DECK LIGHT SWITCH ASSEMBLY

(a) Remove the deck light switch assembly.

Click here

(b) Inspect the deck light switch assembly.

Click here

NG

REPLACE DECK LIGHT SWITCH ASSEMBLY

OK

10.

CHECK HARNESS AND CONNECTOR (DECK LIGHT SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)

(a) Disconnect the J50 deck light switch assembly connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J50-10 (CGLP) - J165-23 (CGSW)

Always

Below 1 Ω

J50-7 (E) - Body ground

Always

Below 1 Ω

J50-10 (CGLP) or J165-23 (CGSW) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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