Module id/location number?

Yes, but in greater hybrid world that sometimes can be more confusing than saying module #1 is the first place the batteries negative cable connects to.

 

AFAIK all scanners and apps - on Gen2 Prius - number the HV battery blocks as 1 (module 1 & 2) being opposite from the ecu and 14 (module 27 & 28) is closest to the ecu.

Posted via the PriusChat mobile app.

 

yes, but each iteration puts components in packs in slightly different locations. For example a rebuilder I know used a method that got negative part of pack at first module backwards in a Prius C, even though it wasn't. So to keep from it getting confusing, it's best to explain #1 module as where negative cable of pack connects.

 

Luckily, we are discussing Gen 2s in these Gen 2 forums. So it is quite accurate to state it as @mr_guy_mann did.

 

There's a post over here that shows how you can double-check using the color codes of the voltage-sensing wires (the skinny ones that connect at every second module down the length of the pack).

There's been a rule often given that "#1 is where the cable goes on the ⊖ end of the module", but the gen 1 Prius was an exception to that rule. Maybe the rule is right for all the generations after gen 1, but usually as soon as I see one exception to a "rule" I become cautious about it, and just say "eh, I'll double-check for my car".

The post I linked doesn't include the diagram with color codes for Prius c, so somebody might have to look that up.

Toyota Service Information and Where To Find It | PriusChat

One case where the color coding might not be enough would be if there's been previous work on the battery and that voltage-sensing wire harness (or "no. 2 frame wire") was replaced with an aftermarket one; those might not match the factory color codes.

In a car where the "connected at ⊖ end is #1" rule holds—remember it doesn't hold for all generations, but in a car where it does—the location that matters is where the cable connects to that module, not wherever the other end of the cable might attach to the relay.