Toyota Camry (XV70): ACC Signal Circuit

Toyota Camry Repair Manual XV70 (2018-2024) / Vehicle Interior / Lighting (int) / Lighting System / ACC Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ACC or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
First, check for smart key system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.*
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*
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*: w/ Smart Key System

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
ACC SW	Ignition switch ACC signal	OFF or ON	OFF: Ignition switch off ON: Ignition switch ACC	"ON" is also displayed for this item when the ignition switch is ON.

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ACC SW

Ignition switch ACC signal

OFF or ON

OFF: Ignition switch off

ON: Ignition switch ACC

"ON" is also displayed for this item when the ignition switch is ON.

Body Electrical > Main Body > Data List

Tester Display
ACC SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the 3F instrument panel junction block assembly connector.

(b) Disconnect the 3B instrument panel junction block assembly connector.

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

Standard Voltage:

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3B-3 - Body ground	Always	Below 1 ?
K51-19 (GND2) - Body ground	Always	Below 1 ?

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the instrument panel junction block assembly.

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(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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Standard Resistance:

Tester Connection	Condition	Specified Condition
3F-1 - MB-30 (ACC)	Battery not connected to 3A-30 and 3B-3	10 k? or higher
3F-1 - MB-30 (ACC)	Battery positive (+) > 3A-30 Battery negative (-) > 3B-3	Below 1 ?

Tester Connection

Condition

Specified Condition

3F-1 - MB-30 (ACC)

Battery not connected to 3A-30 and 3B-3

10 k? or higher

3F-1 - MB-30 (ACC)

Battery positive (+) > 3A-30

Battery negative (-) > 3B-3

Below 1 ?

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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