The 12V starter has never worked in my 2000 MT A/C Insight. Problem: No crank (turn key, no action; no click etc. Instrument lights do come on). I've been running through some diagnostics. The car has always started fine with the IMA battery; except when IMA/CEL was on for an extended period of time and the IMA battery depleted. I've had the battery disconnected for a few days while I've been doing some interior work and now the IMA battery registers empty so the car isn't starting with the 12V or IMA.
I've checked (with IMA battery in OFF position):
-Ground wires. Air box ground was broken; all grounds were replaced with 4 gauge cable.
-Removed starter, disassembled, cleaned and reinstalled. Looked fine and hardly used.
-12V battery is good (jumped starter fine, see next step). Swapped with a new MT34 and no change.
-Applied 12V directly to the starter solenoid and it engaged; sounded alright.
-Jumped clutch switch with a paperclip, no change.
-Checked fuse 9 7.5A, worked fine
-Tried starting with BCM connectors disconnected (and IMA battery switch off); no change.
-Verified that the green immobilizer key warning on the instrument cluster functions correctly; replaced the bulb with a known working bulb. Green key does NOT come on when trying to start. So I assume it is not a problem with immobilizer system. Tried 2 master keys and 1 valet, no change. Tried 2 Honda keys from other cars but they won't turn in ignition, so can't tell if green immobilizer warning will come on.
-Verified (with test light) that START position gets voltage to BLK/WHT wire at ignition switch.
-A24 in ECM gets a bright test light in START position. A1 gets a dim test light in START position. I'm assuming this is my problem. How does the ECM ground? I've been testing it unbolted from the car
*Can I start the car (and drive it normally) by simply turning the key to position II and applying 12V to the starter with a jump cable?
*What is up with the ECM?
I am limited to a test light. I have access to a fluke/voltage meter but am not very familiar with their usage. I would rate my mechanical ability at a 7.5/10.
Main diagnostic I've been following: Insight manual, wiring PDF, page 82