For 1990-2009 cars only
Battery voltage is supplied to the body control module (BCM) by circuit 1640. This input is internally monitored by the BCM for proper operating voltage. The proper operating voltage range is from 9-16 volts.
DTC Parameters
| • | The voltage on circuit 1640 is more than 18.5 volts |
| • | The condition exists for 5 seconds. |
Diagnostic Aids
| • | Check for a poor connection at the BCM. Inspect ground integrity circuit 550 using DVOM. Inspect the harness connectors for backed out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals, and poor terminal-to-wire connection, terminal crimped over wire insulation and not conductors. |
| • | Check the charging system for proper voltage. |
| • | Inspect the wiring harness for damage. Check for broken or chaffed insulation. |
| • | If a fault is suspected to be intermittent, wiggling the harness wiring may help in locating the fault. |
