On-Vehicle Inspection

POWER DISTRIBUTION: INTEGRATION RELAY: ON-VEHICLE INSPECTION

1. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (SIGNAL READING CHECK)

NOTICE:
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.

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

(a) 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.





Text in Illustration





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





HINT
* Present signal reading and history signal reading will be displayed alternately after the power switch is turned 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:






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

(a) Results of signal reading check

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





HINT
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 Removal.

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

Standard Voltage:





Text in Illustration





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