2010 Cadillac CTS Sedan AWD V6-3.6L Page 216
Ignition in Run or Accessory positions.
Conditions for Setting the DTC
B370C
An open, short to ground or a short to voltage has been detected on the signal circuit.
B370D
An open, short to ground or a short to voltage has been detected on the control circuit.
Action Taken When the DTC Sets
Moisture sensitive wiper operation is suspended so long as the fault is present. The wipers will still operate normally in all other modes.
Conditions for Clearing the DTC
* A current DTC will clear when the fault is no longer present.
* A history DTC will clear after 40 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Wiper/Washer Schematics (See: Wiper and Washer Systems/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Wiper/Washer System Description and Operation (Wiper and Washers) (See: Wiper and Washer Systems/Description and
Operation/Wiper/Washer System Description and Operation (Wiper and Washers))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, wiper switch in the LOW position. The windshield wipers should operate at low speed. If the windshield wipers do not operate, refer
to Windshield Wiper System Malfunction (See: Wiper and Washer Systems/Testing and Inspection/Symptom Related Diagnostic
Procedures/Windshield Wiper System Malfunction).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the windshield outside moisture sensor.
2. Test for less than 5.0 ohms between the ground circuit terminal 3 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between ignition voltage circuit terminal 4 and ground.
瀚慖f the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
4. Ignition ON, test for 4.0 - 8.5 volts between the control circuit terminal 1 and ground.
瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
5. Ignition OFF, connect the harness connector at the windshield outside moisture sensor.
6. Disconnect the X4 harness connector at the BCM.
