For 1990-2009 cars

## DTC B0198 LHD

### Diagnostic Instructions

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

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

• | 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Blower Motor Faulty Circuit | B0193 06 | B0193 06 | -- | --

### Circuit Description

The blower control module is an interface between the HVAC control module and the blower motor. 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 controller in order to command the blower motor speed. The control processor uses the blower motor ground or low reference as a low side control to adjust 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

### 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

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References

### 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 voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.

⇒ | If the test lamp stays illuminated all the time. Test the control circuit for short to ground. If the circuit tests normal, replace the HVAC control module.

⇒ | If the test lamp does illuminate and change intensity. Test or replace the blower motor..

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Refer to Blower Motor Replacement

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