No crank, no start

BLESSING EWOBOR

MEMBER
2006 LEXUS RX 350
6 CYL
2WD
AUTOMATIC
156,345 MILES

Hello, the vehicle sometime would not give a sign of cranking, I checked the voltage or power source on the solenoid, there was none while cranking but sometimes there will be power. With the ignition switch in "on" position, I use wire to connect Power from the battery to the solenoid, the vehicle start. Please could you help me with the cranking circuit diagram?

Friday, October 23rd, 2020 AT 6:26 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

If you get power sometimes and not others to the S terminal on the starter, chances are the starter relay is failing. Here is a link that shows how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If you look at pic 1 below, it is a portion of the starting system wiring schematic. I highlighted the relay and its location. Pic 2 shows the relay's position in the relay box.

This is where I would start.

Let me know what you find.

Joe

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Friday, October 23rd, 2020 AT 8:30 PM

BLESSING EWOBOR

MEMBER
754 POSTS

Thank you, but for the first diagram you didn't add the top. Please add it.

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Monday, October 26th, 2020 AT 8:14 PM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Here is the entire starting system schematic. Please note this is for an 2007 RX350. I am showing nothing for an 2006. Since these were introduced in 2006, I suspect it was a late production.

I hope this helps.

Joe

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