Circuit Description

Dash Integration Module (DIM) has a designated circuit for monitoring vehicle system voltage via Class 2 serial data line. DIM sends system voltage status to modules that do not monitor system voltage via Class 2 serial data line. When DTC B1390 is set in DIM, system voltage status sent to other modules will default to 12.9 volts.

DTC B1327 will set as current when voltage is less than 9 volts for 1.2 seconds and ignition switch is not in OFF or CRANK position. When DTC is set, modules disable ability to set "U" codes or other DTCs.

DTC will clear from current status when voltage is greater than or equal to 9.4 volts for 1.2 seconds. History DTC will clear after 50 consecutive ignition cycles if condition for malfunction is no longer present. Scan tool can be used to manually clear DTC.