THEFT DETERRENT SYSTEM Engine Hood Courtesy Switch Circuit

DESCRIPTION

The engine hood courtesy switch is installed together with the hood lock. This switch turns on when the engine hood is closed and turns off when the engine hood is opened.

WIRING DIAGRAM

INSPECTION PROCEDURE

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. Entry the following menus: Body / Main Body / Data List.

   5. According to the display on the intelligent tester, read the Data List.

      Main Body (Main Body ECU (Multiplex Network Body ECU))

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Hood Courtesy SW	Engine hood courtesy switch signal/ON or OFF	ON: Engine hood closed OFF: Engine hood open	-

      OK
      The indicator on the intelligent tester switches between ON and OFF in accordance with the engine hood courtesy switch (hood lock assembly) status.

   
   

   NG

   INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

   OK

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

2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Disconnect the 2C instrument panel junction block assembly and MB main body ECU (multiplex network body ECU) connectors.

      

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2C-38 - MB-20 (HCTY) Always Below 1 Ω

      Text in Illustration

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

   
   

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   OK

3. CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH - BODY GROUND)

   
   

   1. Disconnect the A60 engine hood courtesy switch (hood lock assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A60-1 - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH - MAIN BODY ECU)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition A60-2 - 2C-38 Always Below 1 Ω A60-2 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)

   
   
   1. 

      Text in Illustration

      *1	Unlock
      *2	Lock
      *a	Component without harness connected (Engine Hood Courtesy Switch (Hood Lock Assembly))

      Remove the engine hood courtesy switch (hood lock assembly) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A60-2 - A60-1 Locked Below 1 Ω Unlocked 10 kΩ or higher

   
   

   NG

   REPLACE ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) Click here

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)