Circuit Description
The body control module (BCM) monitors the supply voltage circuit of the wiper 1 relay. The voltage should be low while the wiper 1 relay is de-energized. The voltage will be near system voltage when the BCM energizes the wiper 1 relay. The supply voltage circuit of the wiper 1 relay is shared with the signal circuit of the windshield wiper motor park switch internally in the BCM. The BCM monitors the signal circuit of the windshield wiper motor park switch to determine if the windshield wiper motor is operating when commanded. The voltage on the signal circuit of the windshield wiper motor park switch should be near system voltage while the wipers are active. This is the result of the windshield wiper motor park switch being open. The voltage is pulled low when wipers are in or return to the Park position. The windshield wiper motor park switch will be closed, pulling the circuit to ground.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B3715 Front Wiper Relay Drive Circuit |
| • | DTC B3716 Front Wiper Relay Drive Circuit Range/Performance |
| • | DTC B3717 Front Wiper Relay Drive Circuit Low |
| • | DTC B3718 Front Wiper Relay Drive Circuit High |
| • | DTC B3719 Front Wiper Relay Drive Circuit Open |
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Windshield wiper motor commanded on. |
Conditions for Setting the DTCs
The following conditions will cause these DTCs to set:
B3715
The signal circuit of the windshield wiper motor park switch has not transition from a high to low state when the windshield wiper motor was commanded on.
B3717 or B3719
The BCM detects a low voltage level or open on the supply circuit of the wiper 1 relay when the relay is energized.
B3718
The BCM detects a high voltage level on the supply circuit of the wiper 1 relay when the relay is energized.
Action Taken When the DTC Sets
The windshield wipers will be disabled until the conditions mentioned above are no longer present.
Conditions for Clearing the DTC
| • | This DTC will change from current to history when the fault is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Listen for an audible click when the Wiper 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
-
Verifies that the BCM is providing voltage to the Wiper 1 relay.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the windshield wiper/washer system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Are the wipers always on? | -- | Go to Step 28 | Go to Step 4 |
4 | Operate the windshield wiper/washer switch through all the switch positions. Do the windshield wipers park correctly? | -- | Go to Step 5 | Go to Step 8 |
5 | Turn the wiper/washer switch to the High position. Do the windshield wipers operate? | -- | Go to Step 8 | Go to Step 6 |
6 |
Does the scan tool indicate that Off, Delay 1, Delay 2, Delay 3, and Mist/Hi/Lo is correctly displayed each wiper/washer switch position? | -- | Go to Step 10 | Go to Step 7 |
7 |
Is the resistance within the specified range? | 1700-9500 ohms | Go to Step 19 | Go to Step 24 |
8 |
Does the Wiper Park Switch Data parameter display Off? | -- | Go to Step 20 | Go to Step 9 |
9 | While observing the Wiper Park Switch Data parameter, connect a 3-ampere fused jumper wire from the signal circuit of the windshield wiper motor park switch to good ground. Does the Wiper Park Switch Data parameter display On? | -- | Go to Step 26 | Go to Step 21 |
Do you hear a click from the wiper 1 relay in the underhood fuse block, when you command the relay ON and OFF? | -- | Go to Step 13 | Go to Step 11 | |
Does the test lamp illuminate? | -- | Go to Step 25 | Go to Step 12 | |
12 |
Does the test lamp illuminate? | -- | Go to Step 29 | Go to Step 22 |
13 |
Does the test lamp illuminate? | -- | Go to Step 14 | Go to Step 23 |
14 | Connect a 10-ampere fused jumper wire from the wiper 1 relay switched input to the switched output to voltage circuit of the wiper 2 relay switched input. Does the wiper motor operate at low speed? | -- | Go to Step 25 | Go to Step 15 |
15 |
Does the test lamp illuminate? | -- | Go to Step 16 | Go to Step 31 |
16 | Connect a 10-ampere fused jumper wire from the wiper 2 relay switched input to the relay switched output to the low speed circuit of the windshield wiper motor. Does the wiper motor operate? | -- | Go to Step 25 | Go to Step 17 |
17 |
Does the test lamp illuminate? | -- | Go to Step 26 | Go to Step 18 |
18 | Connect a test lamp from the low speed circuit of the wiper motor to a good ground. Does the test lamp illuminate? | -- | Go to Step 33 | Go to Step 32 |
19 | Test the signal circuit of the wiper/washer switch for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 27 |
20 | Test the signal circuit of the wiper motor park switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 27 |
21 | Test the signal circuit of the wiper motor park switch for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 27 |
22 | Test the supply voltage circuit of the wiper 1 relay coil for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 27 |
23 | Test the battery voltage circuit of the wiper 1 relay switched input for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 30 |
24 | Inspect for poor connections at the harness connector of the windshield wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 34 |
25 | Inspect for poor connections at the inoperative wiper relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 35 |
26 | Inspect for poor connections at the harness connector of the windshield wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 36 |
27 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 38 | Go to Step 37 |
28 | Repair a short to voltage in the supply voltage circuits of the wiper 1 and wiper 2 relay coils. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
29 | Repair an open or high resistance in the ground circuit of the wiper 1 relay coil. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
30 | Repair a short to ground on the low or high speed circuit of the windshield wiper motor. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
31 | Repair an open or high resistance in the battery voltage circuit of the wiper 2 relay switched input. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
32 | Repair an open or high resistance in the low speed circuit of the windshield wiper motor. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
33 | Repair an open or high resistance in the ground circuit of the windshield wiper motor. Refer to Wiring Repairs or Connector Repairs . Did you complete the repair? | -- | Go to Step 38 | -- |
34 | Replace the windshield wiper/washer switch. Refer to Windshield Wiper and Washer Switch Replacement . Did you complete the replacement? | -- | Go to Step 38 | -- |
35 | Replace the inoperative wiper relay. Did you complete the replacement? | -- | Go to Step 38 | -- |
36 | Replace the windshield wiper motor. Refer to Windshield Wiper Motor Replacement . Did you complete the replacement? | -- | Go to Step 38 | -- |
37 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 38 | -- |
38 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
