Circuit Description
When intermittent or mist operation of the windshield wiper is selected, battery
voltage from the wiper switch is applied to the front wiper input of the body control
module (BCM). The BCM responds by switching circuit 1445 to ground. This action energizes
the front wiper relay, providing low speed operation of the wiper motor during single
swipes.
Control of the wiper during continuous LO or HI speed switch settings is direct
wired from the wiper switch to the wiper motor and is not under the control of the
BCM.
Conditions for Setting the DTC
| • | Ignition is in RUN or ACC position |
| • | Mist or Intermittent wiper switch setting selected (output is On) |
| • | Circuit 1445 shorted to battery voltage |
| • | No light will illuminate in I/P. |
Diagnostic Aids
| • | When a shorted to battery voltage condition exists in circuit 1445 and
the BCM has been requested to activate the front wiper relay, the BCM will attempt
to switch circuit 1445 to ground. High current flow will result and the BCM output
will go into a protective state. The BCM output will not allow itself to be activated
for as much as three minutes. |
| • | Inspect wiring harness for damage. Check for broken or chaffed insulation. |
| • | If fault is suspected to be intermittent, wiggling harness wiring may
help in locating fault. |
| • | Check for poor connection at the BCM. Inspect harness connections for
backed out terminals, improper terminal mating, broken connectors locks, improperly
formed or damaged terminals and poor terminal-to-wire connection (terminal crimped
over wire insulation not conductors). |
