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Hello, the most common issue is a poor connection to the FICM module. Make sure all the connectors are fully seated. if this looks ok then an inspection of the wiring harness to the FICM could be a problem, the harness has been known to chafe in several areas going to the FICM on the earlier builds. You would have to verify power and ground going to the FICM. There must be battery voltage going in to the module in order for it to bump up the voltage to 48 volts. There was a recall to inspect the wiring in the past.
Do you need more help with this concern? Make sure you have power at the ficm relay supplying power to the ficm.
As it shows in the diagram i supplied it has the ficm relay in the auxillary relay box and is powered by fuses in the under dash fuse panel. Check the fuses for the relay, trace the circuit to the relay. The from the relay to the FICM
Then you have to verify t he pins on the connector are getting battery voltage from the relay to the ficm or its a wiring problem or pin fit of the connector.
Thats correct, to all the power wires from the relay to the ficm You can take a 12 volt brake light bulb and jump from the connector through the bulb. If the power supply is god it will light the bulb when applying power to one side and ground to the other side of the test bulb
You are welcome, here is the connector pin layout. If you need more help please let me know. If I was helpful, please leave a positive rating.
Very good, thank you!