Replaced Alternator, Now Car Won't Start. HELP!
05-28-18, 06:22 PM
#31
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Looked at your diagram.
Bare bones - do this:
Remove relay keeping pins 1 & 2 and 3 & 5 in orientation with the socket.
Ohm to ground pins 1 & 2 (socket). Determine which goes to ground (battery Neg). Meter will read like <3.0 ohms... Lets say thats pin #2. OHM pin #1, lets say thats infinite or > 1,000 ohms.
Insert your test lamp On Pin #1 attaching the other end to Ground (batt Neg). Push the start button. Does the lamp light??? If yes, Great News, you narrowed the problem to the starter or wire to the solenoid. If no, tow it to Lexus.
TEST #2
Key On, meter set to vdc or test lamp, connect meter or lamp to ground. Probe socket pins 3 & 5. One should have 12vdc. The other nothing. Let say the nothing side is pin 5.
Set meter to Ohms. Ohm pin 5 to ground. It should be like 5 to 20 ohms. If its not, you likely knocked the wire loose installing the alternator.
If it has like 5 ohms of resistance, use a small jumper wire into pin 5, tap the wires other end to battery plus +12. What do you hear? Does it click? Does the starter turn the engine over?
Thats the basics. Let us know what you find.
Bare bones - do this:
Remove relay keeping pins 1 & 2 and 3 & 5 in orientation with the socket.
Ohm to ground pins 1 & 2 (socket). Determine which goes to ground (battery Neg). Meter will read like <3.0 ohms... Lets say thats pin #2. OHM pin #1, lets say thats infinite or > 1,000 ohms.
Insert your test lamp On Pin #1 attaching the other end to Ground (batt Neg). Push the start button. Does the lamp light??? If yes, Great News, you narrowed the problem to the starter or wire to the solenoid. If no, tow it to Lexus.
TEST #2
Key On, meter set to vdc or test lamp, connect meter or lamp to ground. Probe socket pins 3 & 5. One should have 12vdc. The other nothing. Let say the nothing side is pin 5.
Set meter to Ohms. Ohm pin 5 to ground. It should be like 5 to 20 ohms. If its not, you likely knocked the wire loose installing the alternator.
If it has like 5 ohms of resistance, use a small jumper wire into pin 5, tap the wires other end to battery plus +12. What do you hear? Does it click? Does the starter turn the engine over?
Thats the basics. Let us know what you find.
05-28-18, 07:23 PM
#32
Turn the key on and try it again.
NO!
That says the solenoid wire, solenoid, starter, battery and cable are all fine. It says the interlock electronics between pushing the button and delivering energy to that purple relay have failed.
You put the test light on the socket? If it lights when start button is pushed, you lost ground.
Does it have ground? No ground and the relay wont work.
Please read those posts again.
NO!
That says the solenoid wire, solenoid, starter, battery and cable are all fine. It says the interlock electronics between pushing the button and delivering energy to that purple relay have failed.
You put the test light on the socket? If it lights when start button is pushed, you lost ground.
Does it have ground? No ground and the relay wont work.
Please read those posts again.
Last edited by 2013FSport; 05-28-18 at 07:28 PM.
06-07-18, 12:24 PM
#33
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Well looks like I have fried the ECM! Ugghhhh how did that happen? Anyone know what else would be needed in addition to the ECM to be replaced? I have Techstream would I be able to reprogram it or it would have to be done at the dealership?
06-11-18, 08:17 AM
#35
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Well I took the car to an Auto Electric place and that's what they said. But replaced it and still no luck. Car will not communicate with obd reader or Techstream. So now I still do not know what the issue is.
11-05-19, 09:20 AM
#37
Driver School Candidate
I am having the exact same problem except my light will not turn green… Only red
Looks like others went down this road on other models...
Fuseable link in panel, the buss bar part. Not sure how they blew it, but worth checking...
https://www.clublexus.com/forums/gs-...m-to-work.html
Fuseable link in panel, the buss bar part. Not sure how they blew it, but worth checking...
https://www.clublexus.com/forums/gs-...m-to-work.html
update: I have been running a cheap diagnostic tool when it said check engine occasionally usually for it to say that it found one code, near hit read code and it say no DTC… Frustrating well just now it actually mentioned something about a flow or volume sensor
for a couple seconds before returning to know DTC
please please help!!!!
11-05-19, 01:57 PM
#38
Maybe time to take it to a shop...
11-05-19, 08:25 PM
#39
Driver School Candidate
11-15-19, 08:58 AM
#40
Driver School Candidate
**CORRECTION: No the light IS NOT Green. It stays red.... So sorry it has taken so long for me to reply we had a major family emergency. Sure i true how good and bad come in waves... I think im ready for my wave of good lol. HELP!
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