OBDII when forcing radio on.

Steering Wheel & Radio Replacement Combo
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Yoshimura
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OBDII when forcing radio on.

Post by Yoshimura » Tue Dec 11, 2018 11:03 am

I have an Alpine iLX-207 installed in our RV (a Ram ProMaster 2018) using the Maestro RR and the CH3 T-Harness. In order to be able to use the radio for long period of time, I used a switch to connect the headunit ACC signal from either the RR or the battery.

Everything work well except for a OBDII communication error (the headunit display a message) when I turn the radio on using the switch. I assume the error comes from the fact that the RR is trying to query some powered down modules, right? I also assume the RR tries to communicate with the vehicle because of requests coming from the iDatalink, right?

I don't know its exact states but the RR is greyed out in the headunit menu after the error.

Is there a way I could prevent this? Otherwise, some explications of what is happening would be appreciated.

Many thanks!!!!

JustinFerroni
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Re: OBDII when forcing radio on.

Post by JustinFerroni » Tue Dec 11, 2018 11:10 am

The reason for the CAN error message is that the MRR is not powering on when you use the manual switch. there is no fix for the message because your CAN system is not active if the key is not in the on position to power the MRR on.
Justin Ferroni
Technical Support Specialist- Maestro
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Yoshimura
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Re: OBDII when forcing radio on.

Post by Yoshimura » Tue Dec 11, 2018 11:33 am

I don't know exactly how the MRR power is normally controlled (there is no ACC signal in the factory radio harness) but in my current setup, both the radio and the MRR are in fact powered from the coach battery when my switch is set to "Coach". The switch used is DPDT and one pole select the Batt+ source (chassis or coach) for both the radio and the MRR and the other pole select the ACC source (MRR or chassis batt).

Also, if the reason of the error would be that the MRR is not powered, the actual source of the error would be the iDatalink (and not the OBDII), right?

Thanks for your support!!!!

Yoshimura
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Re: OBDII when forcing radio on.

Post by Yoshimura » Tue Dec 11, 2018 11:53 am

I have a few specific questions if you don't mind...

- If there is no ACC pin in factory radio connector, how the MRR power is then controlled? Maybe the MRR is listening on the the BUS for a wake up signal while it's sleeping?

- Why there is no CAN error when the radio is kept powered on using the Retained Accessory Power option. Is this a vehicle feature (meaning the vehicle CAN bus is also kept active)?

- If the error is because because the MRR is powered down (or should I say sleeping?), the error is in fact at the iDatalink level, right? I mean, if the MRR is powered down, the state of the CAN bus should be irrelevant.

Thanks again!

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Zack Flynn
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Re: OBDII when forcing radio on.

Post by Zack Flynn » Tue Dec 11, 2018 8:02 pm

The RR does not power on from the red wire in the harness. Its gets its on state messaging from the CAN in the vehicle. You are simply powering the radio on when you use your hardwired switch, not the RR. There is no fix for that for the error message. The RR is not turning on unless it sees the vehicle on thru its CAN communication
Zack Flynn
Automotive Data Solutions
Technical Support & MECP Master Installation Technician
Zachary.flynn@adsdata.ca

Yoshimura
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Re: OBDII when forcing radio on.

Post by Yoshimura » Tue Dec 11, 2018 9:37 pm

Hello Zack,

I'm not trying to power on the RR using its red wire (which seems to be an output to power up the radio). Only the radio yellow/red and MRR yellow are connected to the coach battery when the switch is activated. The MRR red is then not connected.

Is the error message really because the CAN bus is not active or because the MRR is not responding. What about disconnecting the MRR power (its yellow wire)?

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Dara DeGrand
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Re: OBDII when forcing radio on.

Post by Dara DeGrand » Wed Dec 12, 2018 8:58 am

Yes, that is really the problem. The RR wakes up on can. If the RR is not awake and the radio is, you will get an error message. The only way to get rid of it would be to completely remove power from the maestro when you are forcing the radio on.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

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