Toyota Hybrid "No-Start" No Ready Light

Cody Diagnostician Illinois Posted   Latest  
Resolved
Electrical
2009 Toyota Camry Hybrid 2.4L (B 2AZ-FXE) (P311) — 4T1BB46K39U103417
B2799
U0129 — Lost Communication With Brake System Control Module "A"
C1242
U0123 — Lost Communication With Yaw Rate Sensor Module
U0124 — Lost Communication With Lateral Acceleration Sensor Module
U0126 — Lost Communication With Steering Angle Sensor Module
B2285
B2287
B2288
B2785
B2784
B2786
No Crank / No Start
No Ready Light

Hey guys I have a Toyota Camry Hybrid here from a Body Shop that has a No Ready Light condition, sorry for the long post.

The guy who dropped the car off states that the car was in a fender bender on the right front. They fixed the car and it sat for a while, the customer ended up abandoning the vehicle. After sitting this problem occurred. They did a little digging themselves and found a mouse nest in the Glove Box area. He said the ECU IGN 2 Fuse was blown when they started looking into this problem and will blow when replaced. They put a 10 Amp Fuse in and it stopped blowing.

They showed me that if the ECU IGN 2 Fuse in the Instrument Panel Fuse Box is pulled, then a Key FOB Button is Pressed, then if you wait for the Red Light on the Start Button to stop flashing the Ready Light will come on and you can drive it, but the P/S doesn't work. If you put the ECU IGN 2 fuse back in while the car is running the P/S comes back but the ABS/ Traction Control Lights come on.

I checked the ECU IGN 2 Fuse Circuit and found it gives power to several Modules. When the Key is Off the fuse has a 2.5-3.5 volt pulsing Voltage. I unplugged each module one at a time and the pulsing voltage never goes away. If I unplug the Steering Lock ECU the pulsing voltage goes away.

I took the Center Console out to get to the YAW Rate Sensor Module and found more nesting material underneath the Radio area. I don't see any damaged wires.

When the ECU IGN 2 Fuse is pulled and the Start Button is pressed the Steering Lock ECU starts making a clicking noise until the Ignition is turned off.

I checked Power and Ground to the Steering Lock ECU and found Pin #6 a White and Black Wire that prodemand calls SGND has a pulsing Voltage on it until it is unplugged.

It appears Pin #6 goes to a J/B 4 and is right next to another J/B that has the exact same connector only a different color.

I'm thinking the Steering Lock ECU is bad and causing an Immobilizer issue, but I don't see how it is affecting the ECU IGN 2 Fuse Circuit.

I can't find any R&R procedures for it.

Does the whole Steering Column need to be replaced? Does it need to be programmed?

Thanks in advance.

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Philip Educator
California
Philip
 

“I checked the ECU IGN 2 Fuse Circuit and found it gives power to several Modules. When the Key is Off the fuse has a 2.5-3.5 volt pulsing Voltage. I unplugged each module one at a time and the pulsing voltage never goes away. If I unplug the Steering Lock ECU the pulsing voltage goes away.” Doesn't it seem like the CAN hi signal has been wired to the power supply somehow? I suppose that the…

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Erik Diagnostician
Florida
Erik
 

Look up theft deterrent and it will have all the components as well as immobiliser. Befor you go any further Jump DLC TC to CG for at least 30 min since this thing sat forever and was unable to move anywhere. That should get the codes for the Certification ECU and Key Fob “re-intiliaized”. Other than without looking at Immobiliser PID data I cant go any further helping you. Refer to Section 6…

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Sean Owner/Technician
California
Sean
 

Very cool, an education all by itself, I will have to catch up later but will really read that through, at this moment looking for techs to work, getting the jobs out of the door, trying to keep doors open and client happy-imagine that….

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Eric Owner/Technician
Michigan
Eric
 

Are you certain the 12 volt battery is healthy? It is specific to Camry hybrids, to my knowledge we have only been able to source through Toyota. It sure sounds like battery voltage is too low on initial ready command. I would make absolutely certain it is in good shape before proceeding. After this long of sitting, it could easily be bad. Toyota modules are very robust, not unheard of but very…

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Agree
Cody Diagnostician
Illinois
Cody
   

I tried jumping pins TC and CG at the DLC for a little over 30 minutes with a battery maintainer hooked up and the key taped to the start button. No change. I did some more testing at the Steering Lock ECU with my scope. I found that with the connector plugged in on Pin #6 white and black wire has a 1.8 - 2.5 volt waveform. When I unplug the Steering Lock ECU it drops to a steady .8 volts. If I…

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Erik Diagnostician
Florida
Erik
 

It still looking like your key is not the right one. The Immobilizer is still SET which is not allowing the steering lock to release. You got a good one there. I would look at the appendix and follow those steps as redundant as it is. They help. It will narrow you down to a specific component along with Terminals of ECU for the Immobilizer or Certification ECU. The appendix has waveforms too.

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Cody Diagnostician
Illinois
Cody
   

I backprobed Pin 5 Orange LIN at the Steering Lock ECU. With the Key Off the LIN appears to be communicating. When I turn the Key On the LIN goes to battery Voltage. I found a known good waveform from iatn and the waveform conditions are inverted(with the Key Off LIN goes to battery voltage and when Key is turned On LIN starts to communicate. I scoped the CAN Bus at several locations. i'm not a…

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Chris Diagnostician
Pennsylvania
Chris
 

Will pull up schematics later to look a little deeper into this but I ran into a similar situation with a Lexus a couple years back. Same body shop deal. Mine ended up being swapped connectors in J/B 4. There are only two connectors in that J/B that are the same shape and can be interchanged. I was getting communication network waveforms on the ground wires. Just a quick thought based on the…

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Cody Diagnostician
Illinois
Cody
 

I did ohm out the pins in those connectors at j/b 4 and made sure the ground connector pins all had continuity and the network pins only had a few that had continuity. Before I go much further we found a cheap steering column assembly we are going to try and at least see what the pins at the steering lock ecu do.

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Cody Diagnostician
Illinois
Cody Resolution
 

Ok guys, got this one figured out. Gave Iden*@#x a call and they helped me get on the right track. Ended up being an open ground circuit in J/B 4 Pin 2 4A internally. The circuit for the Steering Lock ECU Sensor Ground(SGND Pin 2 WHT/BLK). I added an external ground to the circuit and now the car is fixed. Thanks for all the help.

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Resolution Ð Awarded
Cody Diagnostician
Illinois
Cody
 

Thought I'd give you guys an update. Customer brought the car back because the ABS and Traction Control Lights were still on and hadn't previously made it clear they wanted that fixed too. ABS Module had 3 communication codes in it still from previous scan. U0123, U0124 and U0126. Yaw Rate Sensor and Steering Angle Sensor both were missing Grounds. Turns out they get their Grounds from J/B 4…

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