Toyota Tacoma 2015-2018 Service Manual: Cargo Light Circuit

Toyota Tacoma 2015-2018 Service Manual / Lighting / Lighting System / 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 for circuits related to this system before performing the following inspection procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1
- *1: w/ Smart Key System

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (CARGO LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Main Body ECU

Tester Display	Test Part	Control Range	Diagnostic Note
Cargo Light	Cargo light	ON or OFF	Deck light switch assembly is DOOR or on

OK:

Cargo light turns on / turns off.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT CARGO RELAY

(a) Remove the CARGO relay from the junction block assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

REPLACE CARGO RELAY

3.	CHECK HARNESS AND CONNECTOR (CARGO FUSE - CARGO RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Relay terminal 1- Body ground	Always	11 to 14 V
Relay terminal 3- Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (CARGO RELAY - CENTER STOP LIGHT ASSEMBLY (CARGO LIGHT))

(a) Disconnect the C15 cargo light connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Relay terminal 5 - C15-3 (DL)	Always	Below 1 Ω
Relay terminal 3 - Body ground	Always	10 kΩ or higher
C15-1 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT CARGO LIGHT

(a) Remove the cargo light (See page (b) Inspect the cargo light (See page ). ).

(b) Inspect the cargo light (See page ).

REPLACE CARGO LIGHT

6.	INSPECT DECK LIGHT SWITCH ASSEMBLY

(a) Remove the deck light switch assembly (See page (b) Inspect the deck light switch assembly (See page ).

(b) Inspect the deck light switch assembly (See page ).

REPLACE DECK LIGHT SWITCH ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (DECK LIGHT SWITCH ASSEMBLY - CARGO RELAY AND BODY GROUND)

(a) Disconnect the D35 deck light switch assembly connector.

(b) Remove the CARGO relay from the junction block assembly.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
D35-5 (CCTY) - Relay terminal 2	Always	Below 1 Ω
D35-5 (CCTY) - Body ground	Always	10 kΩ or higher
D35-7 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (DECK LIGHT SWITCH ASSEMBLY - DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU)

(a) Disconnect the D35 deck light switch assembly connector.

(b) Disconnect the 1A driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D35-9 (CGON) - 1A-40	Always	Below 1 Ω
D35-9 (CGON) - Body ground	Always	10 kΩ or higher
D35-10 (CGLP) - M6-23 (CGSW)	Always	Below 1 Ω
D35-10 (CGLP) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1A-40 - MB-27 (CGLP)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Driver Side Junction Block)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DRIVER SIDE JUNCTION BLOCK

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