Starter Inrush Current Reduction Relay Circuit [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WAVEFORM (STARTER INRUSH CURRENT REDUCTION RELAY)

Connect the positive (+) lead of an oscilloscope to the positive (+) battery terminal and the negative (-) lead to the negative (-) battery terminal.

While cranking the engine, count the number of times the waveform drops.

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Standard

Waveform drops 2 times

Result

Proceed to
OK
NG

Result: 1

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [11/2016 - ]

Result: 2

REPLACE STARTER INRUSH CURRENT REDUCTION RELAY. Refer to PROCEDURE - Step 3