Question re 2013 hino AC

Chiefman · Dec 3, 2015

Hi guys,

I have a 2013 hino truck ,sorry not sure the model but I have the numbers from the compliance plate.

AC will only come on if I supply the AC relay with an earth...when I do this the system all works and AC is cold..the diagram I have has something called a "lock amp" which looks like it may supply an earth to the relay?
Anyone have ideas of how to locate the "lock amp" and what it is?
Thanks

greasytshirt · Dec 4, 2015

Cab-over-engine or conventional chassis?

What's your location?

Chiefman · Dec 4, 2015

greasytshirt said:
Cab-over-engine or conventional chassis?

What's your location?

Thanks for replying, the cab is over the engine.the truck has a 16000L water tank on the back if that helps,I'm from australia .
I have the details from the build plate,I'm not sure how to identify the model,but I have the numbers etc

greasytshirt · Dec 4, 2015

I have no idea if AUS and US trucks have similar wiring. I gotta look it up.

greasytshirt · Dec 4, 2015

Chiefman said:
Thanks for replying, the cab is over the engine.the truck has a 16000L water tank on the back if that helps,I'm from australia .
I have the details from the build plate,I'm not sure how to identify the model,but I have the numbers etc

Check for two AC fuses. Don't forget the fuse boxes outside of the truck. After that, the blower motor switch is the most likely (if AUS and US trucks are essentially the same).

Chiefman · Dec 6, 2015

greasytshirt said:
Check for two AC fuses. Don't forget the fuse boxes outside of the truck. After that, the blower motor switch is the most likely (if AUS and US trucks are essentially the same).

All the fuses are good,originally the AC2 fuse was missing which I replaced,what I'm searching for is a module or something which supplies an earth to trigger the AC relay? The diagram indicates(if correct) that something called a "lock amp" supplies the earth to the relay. Not sure where or what that is,has about 5-6 wires to it,including a tacho feed....
I'm a bit lost with this one..

Thanks for the info

greasytshirt · Dec 6, 2015

Nothing fitting that description in my books. Can you post a pic of your information?

greasytshirt · Dec 6, 2015

Chiefman said:
All the fuses are good,originally the AC2 fuse was missing which I replaced,what I'm searching for is a module or something which supplies an earth to trigger the AC relay? The diagram indicates(if correct) that something called a "lock amp" supplies the earth to the relay. Not sure where or what that is,has about 5-6 wires to it,including a tacho feed....
I'm a bit lost with this one..

Thanks for the info

Chiefman · Dec 7, 2015

that diagram is definitely different to the one i have,although I cant confirm the one i have is correct. I will try and scan what I have and post it...

on the diagram you posted what is J/C & J/B?

greasytshirt · Dec 7, 2015

Chiefman said:
that diagram is definitely different to the one i have,although I cant confirm the one i have is correct. I will try and scan what I have and post it...

on the diagram you posted what is J/C & J/B?

Junction box and junction connector.
This is for a 2013 195 COE