Security Horn Circuit [08/2013 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Perform the Active Test according to the display on the Techstream.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Security Horn	Security horn	OFF/ON	-

   OK

   The security horn assembly sounds and stops correctly when operated through the Techstream.

NG → See step   2 

OK → See step   8 

1. Remove the security horn assembly. Refer to REMOVAL [08/2013 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Check the operation of the security horn assembly.

   Standard

   Connection	Specified Condition
   Auxiliary battery positive (+) → Terminal 1	Horn sounds
   Auxiliary battery negative (-) → Horn body

NG → See step   10 

OK: Go to next step 

1. Remove the S-HORN relay from engine room relay block and junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When auxiliary battery voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	When auxiliary battery voltage is applied between terminals 1 and 2	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	S-HORN Relay

NG → REPLACE S-HORN RELAY 

OK: Go to next step 

1. Remove the main body ECU (multiplex network body ECU). Refer to REMOVAL [08/2013 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

2. Disconnect the 3D instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3D-14 - MB-17 (SH)	Always	Below 1 Ω

NG → See step   9 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Engine room relay block and junction block assembly S-HORN relay terminal 1- Body ground	Power switch off	11 to 14 V
   Engine room relay block and junction block assembly S-HORN relay terminal 5 - Body ground	Power switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Engine Room Relay Block and Junction Block Assembly

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Engine room relay block and junction block assembly S-HORN relay terminal 3 - Q19-1	Always	Below 1 Ω
   Engine room relay block and junction block assembly S-HORN relay terminal 3 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Engine Room Relay Block and Junction Block Assembly

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Engine room relay block and junction block assembly S-HORN relay terminal 2 - 3D-14	Always	Below 1 Ω
   Engine room relay block and junction block assembly S-HORN relay terminal 2 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Engine Room Relay Block and Junction Block Assembly

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8