INTEGRATION RELAY ON-VEHICLE INSPECTION

PROCEDURE

1. Click here

   INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (SIGNAL READING CHECK)

   Note:

   Both present and history signal readings will be cleared if the engine room junction block assembly is removed. Make sure not to remove it before inspection.

   Tip:

   The signal readings of the engine room junction block assembly can be checked by inspecting the voltage at the diagnosis terminal.

   
   

   1. Signal reading check

      
      

      1. Turn the power switch on (IG).

      2. 

         Connect the positive (+) terminal of a voltmeter to the engine room junction block assembly and the negative (-) terminal to the body ground.

         Table 1. Text in Illustration

         *a	Component with harness connected (Engine Room Junction Block Assembly)
         *b	Diagnosis Terminal

      3. 

         Using the illustration below as a reference, determine whether any channels are malfunctioning based on the observed signal reading.

         Tip:
         

         • Present signal reading and history signal reading will be displayed alternately after the power switch on (IG). By measuring the duration of each header, the present signal reading and history signal reading can be recognized.

         • A unit malfunction indicates an internal malfunction of the engine room junction block assembly. If a malfunction is detected for any channel from channel 0 to 9, an electrical load connected to the engine room junction block assembly may be malfunctioning or there may be a short in the engine room junction block assembly circuit or in the wire harness.

         • The present signal reading will be stored as a history signal reading when electrical loads are operated after a malfunctioning part returns to normal.

         • Both present and history signal readings can be cleared by disconnecting the cable from the negative (-) auxiliary battery terminal.

         • Regarding electrical loads connected to channels 0 to 9, refer to the table below:

           Channel	Connected Electrical Load
           ch0	Buck up lights
           ch1	-
           ch2	Stop lights
           ch3	Rear fog lights
           ch4	Daytime running lights
           ch5	Front fog lights
           ch6	Rear window defogger wire
           ch7	Mirror heater
           ch8	High beam headlight LH
           ch9	High beam headlight RH

2. Click here

   INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK)

   
   

   1. Results of signal reading check

      
      

      1. Depending on the signal reading, perform troubleshooting according the table below.

         Output Signal Reading	Repair Method
         Normal	Continue troubleshooting for each system.
         The unit is malfunctioning.	Replace the engine room junction block.
         A malfunction in a channel (ch0 to ch9)	Check for a short in the wire harnesses between the engine room junction block assembly and each electrical load. Inspect each of the electrical loads. Replace the engine room junction block.

         Tip:

         Make sure to clear the signal readings by disconnecting the cable from the negative (-) auxiliary battery terminal after replacement or repair of the malfunctioning part.

      2. 

         If no signal readings are output, perform troubleshooting according to the following troubleshooting procedure.

         
         

         1. Remove the engine room junction block assembly (Click here).

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

            Standard Voltage
            Tester Connection Condition Specified Condition 1F-15 (IGN) - Body ground Power switch on (IG) 11 to 14 V

            Table 2. Text in Illustration

            *a	Component without engine room junction block assembly (Engine Room Relay Block and Junction Block Assembly)

            If the result is not as specified, repair or replace the wire harness or connector.