LIGHTING SYSTEM ACC Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the intelligent tester on.

   4. Enter the following menus: Body / Main Body / Data List.

   5. Read the display on the intelligent tester.

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      ACC SW	Power switch ACC signal/ON or OFF	ON: Power switch on (ACC) OFF: Power switch off	"ON" is also displayed for this item when the power switch is on (IG).

      OK
      Normal conditions listed above are displayed.

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - AUXILIARY BATTERY AND BODY GROUND)

   
   

   1. Disconnect the 2E*1 or 2F*2, 2A and 2B instrument panel junction block assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition 2E-1*1 - Body ground Power switch off 11 to 14 V 2F-1*2 - Body ground Power switch off 11 to 14 V 2A-43 - Body ground Power switch on (ACC) 11 to 14 V

      
      

      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2B-4 - Body ground Always Below 1 Ω 2B-6 - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)

   
   

   1. Remove the instrument panel junction block assembly Click here.

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

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

      

      Standard Resistance
      for LHD: Tester Connection Condition Specified Condition 2E-1 - A-29 (ACC) Always 10 kΩ or higher 2E-1 - A-29 (ACC) Auxiliary battery positive (+) → 2A-43 Auxiliary battery negative (-) → 2B-4 Auxiliary battery negative (-) → 2B-6 Below 1 Ω
      for RHD: Tester Connection Condition Specified Condition 2F-1 - A-29 (ACC) Always 10 kΩ or higher 2F-1 - A-29 (ACC) Auxiliary battery positive (+) → 2A-43 Auxiliary battery negative (-) → 2B-4 Auxiliary battery negative (-) → 2B-6 Below 1 Ω

      Text in Illustration

      *a	Component with harness connected (Instrument panel junction block assembly)	*b	Component with harness connected (Instrument panel junction block assembly)
      *c	Component with harness connected (Instrument panel junction block assembly)	*d	Component with harness connected (Instrument panel junction block assembly)
      *e	for LHD	*f	for RHD

   
   

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here