THEFT DETERRENT SYSTEM Engine Hood Courtesy Switch Circuit

DESCRIPTION

• The security courtesy switch is built into the hood lock. This switch turns on when the engine hood is opened and turns off when the engine hood is closed.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   READ VALUE USING INTELLIGENT TESTER (SECURITY COURTESY SWITCH)

   
   

   1. Using the intelligent tester, read the Data List (Click here).

      Table 1. Main Body

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

      OK
      ON (engine hood open) and OFF (engine hood closed) appear on screen according to condition of engine hood.

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT SECURITY COURTESY SWITCH

   
   
   1. 

      Disconnect the A27 switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2 - 3 Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (SECURITY COURTESY SWITCH - MAIN BODY ECU AND BODY GROUND)

   
   

   1. Disconnect the A27 switch connector.

   2. Disconnect the G64 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A27-2 - G64-12 (HD2) Always Below 1 Ω A27-3 - Body ground Always Below 1 Ω A27-2 or G64-12 (HD2) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
4. Click here

   INSPECT SECURITY COURTESY SWITCH

   
   
   1. 

      Disconnect the A27 switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 4 Unlock position Below 1 Ω 1 - 4 Lock position 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (SECURITY COURTESY SWITCH - MAIN BODY ECU AND BODY GROUND)

   
   

   1. Disconnect the A27 switch connector.

   2. Remove the main body ECU (Click here).

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

      Standard Resistance
      Tester Connection Condition Specified Condition A27-1 - A-20 (HCTY) Always Below 1 Ω A27-4 - Body ground Always Below 1 Ω A27-1 or A-20 (HCTY) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
6. Click here

   REPLACE SECURITY COURTESY SWITCHClick here

7. Click here

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

8. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

9. Click here

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here