Diagnosis Of Wiper (P-Models) - On Vehicle - GMC G Service Manual

30. Terminal No. 2
31. Terminal No. 1
32. Terminal No. 3
33. Ammeter; 0*30 Ampere Range
34. Gear Shaft In The Park Position
35. Wiper Ground Strap
Figure 39 — Jumper Connections — High Speed
DIAGNOSIS OF WIPER (P-MODELS) — ON VEHICLE
PROBLEM
1. Blown fuse.
Wiper Not Working or
2. Open circuit in feed wire (No. 2 terminal on
Intermittent
3. Loose mounting of wiper switch.
4. Faulty wiper switch.
5. Open circuit in wire to wiper switch (No. 1
Wiper Will Not Shut
Off. Wiper has Both
"Lo" and "HI" Speeds
Wiper Will Not Shut 1. Defective wiper switch.
Off. Wiper Has "Lo" 2. Grounded wire (No. 3 terminal on wiper
Speed Only
Wiper Will Not Shut 1. Defective wiper switch.
Off. Wiper has "Hi" 2. Open circuit in wire (No. 3 terminal on wiper
Speed Only
Wiper Has "Hi" Speed
Only
Wiper Has "Lo" 1. Grounded wire (No. 3 terminal on wiper
Speed Only
2. Defective wiper switeh.
Blades Do Not Return
To Full Park Position
+
-
F-00809
POSSIBLE CAUSE
wiper motor).
terminal on wiper motor).
Grounded wire (No. 1 terminal on wiper
motor) to wiper switch.
motor) to wiper switch.
motor) to wiper switch.
Open circuit in wire (No. 3 terminal on wiper
motor) to wiper switch.
motor) to wiper switch.
Loose wiper ground strap connection.
CAB ELECTRICAL 8A-35
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30. Terminal No. 2
31. Terminal No. 1
32. Terminal No. 3
33. Ammeter; 0-30 Ampere Range
34. Gear Shaft In The Park Position
35. Wiper Ground Strap
Figure 40 — Jumper Connections — Off
CORRECTION
1. Locate short circuit and repair. Replace fuse.
2. Locate broken wire and repair.
3. Tighten switch mounting.
4. Replace switch.
5. Locate broken wire and repair.
Locate short circuit and repair.
1. Replace wiper switch.
2. Locate and repair short circuit
1. Replace wiper switch.
2. Locate and repair broken wire.
Locate broken wire and repair.
1. Locate short circuit and repair.
2. Replace wiper switch.
Tighten strap connection.
32
30
rv
34
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F-00810
GMTB-0892-2L