B0198

DTC B0198 (RHD)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B0193 06
- Blower Motor not Operating, Short to Ground or Open Circuit

Diagnostic Fault Information






Circuit Description

The blower motor speed control, battery positive and ground circuits enable the control module to operate. The HVAC control module provides a pulse width modulation signal to the blower motor in order to command the blower motor speed.

Conditions for Running the DTC

* The ignition is ON.

* Ignition voltage is between 9-16 volts.

* The HVAC module is ON.

Conditions for Setting the DTC

The blower motor draws more amperage than the HVAC control module is calibrated for.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.

* The DTC can be cleared using a scan tool.

Reference Information

Schematic Reference

HVAC Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Ignition ON, operate the blower fan speed(s).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the blower motor.

2. Ignition ON, connect test lamp at the battery positive voltage terminal A and ground.

• If the test lamp does not illuminate, test the battery positive voltage circuit for short to ground or an open/high resistance.

3. Connect test lamp between the battery positive voltage terminal A and the control circuit terminal B. The test lamp should dimly illuminate at high speeds and reduce in intensity as the blower speed is reduced.

• If the test lamp does not illuminate. Test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.

• If the test lamp does illuminate. Test or replace the blower motor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Refer to Blower Motor Replacement (LHD) Service and Repair

* Control Module References Control Module References for HVAC control module replacement, setup, and programming