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C13 CHECK THE RUN/START RELAY CONTROL CIRCUIT SUPPLY
Measure the voltage between the run/start relay socket pin 1, circuit SBB45 (GY/RD), harness side and ground.
Is the voltage greater than 10 volts? Yes GO to C14. No VERIFY the BJB fuse 45 (10A) is OK. If OK, REPAIR circuit SBB45 (GY/RD). If not OK, REFER to the Wiring Diagrams manual to identify the short to ground in circuit SBB45 (GY/RD). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C14 CHECK THE RUN/START RELAY CONTROL CIRCUIT GROUND FOR AN OPEN
Disconnect: BCM C2280F.
Measure the resistance between run/start relay socket pin 2, circuit CDC55 (BN/VT), harness side and BCM C2280F Pin 18, CDC55 (BN/VT), harness side.
Is the resistance less than 5 ohms? Yes GO to C15. No REPAIR circuit CDC55 (BN/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C15 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between run/start relay socket pin 2, circuit CDC55 (BN/VT), harness side and ground.
Is the resistance greater than 10,000 ohms? Yes GO to C16. No REPAIR circuit CDC55 (BN/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
Yes RECONNECT the electrical connectors and relay. CLEAR the DTCs. REPEAT the self-test. If DTC B1310:14 is still present, Guided Routine (BCM) only available in the on-line Workshop Manual . No INSTALL a new relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C16 CHECK THE RUN/START RELAY
Carry out the appropriate relay component test.
Refer to Wiring Diagrams Cell 149 for component testing.
Is the run/start relay OK? Yes RECONNECT the electrical connectors and relay. CLEAR the DTCs. REPEAT the self-test. If DTC B1310:14 is still present, Guided Routine (BCM) only available in the on-line Workshop Manual . No INSTALL a new relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
I followed the procedure posted by @Strider250, and I think I found a problem with the ground circuit CDC55 between the run/start relay and the BCM. But I'm not sure I did everything correctly, and wasn't sure I wanted to go ripping out wiring based on a shaky diagnosis. So I chickened out and had the truck towed to the dealer. Now preparing to bend over and pay through the...nose.
It was the starter. I was barking up the wrong tree with the run/start circuit. Not sure why that code popped up. Guess I should have checked the starter (duh) before taking it to the dealer. Anyway, it starts and runs now, and my wallet is a good bit lighter.
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Guided Routine (BCM) only available in the on-line Workshop Manual . No INSTALL a new relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
