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) circuit 96. 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.
DTC Parameters
| • | The ignition is in the RUN or ACC position. |
| • | Mist or Intermittent wiper switch setting is selected. |
| • | Circuit 1445 is shorted-to-battery voltage. |
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 3 minutes. |
| • | 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. |
