DTC B0193
Diagnostic Instructions
DTC Descriptors
DTC B0193 01: Front Blower Motor Speed Circuit
Short to Battery |
DTC B0193 06: Front Blower Motor Speed Circuit
Low Voltage/Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Blower Motor Control Module B+
|
B0193 06
|
B0193 06
|
-
|
-
|
Blower Motor B+
|
1
|
1
|
-
|
-
|
Blower Motor Control Module Control
|
B0193 06
|
B0193 06
|
B0193 01
|
-
|
Blower Motor Control
|
2
|
1
|
1
|
-
|
Blower Motor Control Module Ground
|
-
|
1
|
-
|
-
|
1. Blower Motor Inoperative
2. Blower Motor Always ON
|
|
|
Circuit/System Description
The blower motor control module is an interface between the HVAC
control module and the blower motor. The blower motor speed control
from the HVAC control module, battery positive and ground circuits
enable the blower motor control module to operate. The HVAC control
module provides a pulse width modulation (PWM) signal to the blower
motor control module in order to command the blower motor speed.
The blower motor control module transfers the PWM signal into a
corresponding blower motor voltage. The voltage resides between
2-13 V and changes linear to the height of the PWM signal.
Conditions for Running the DTC
• |
The HVAC control module is
ON. |
Conditions for Setting the DTC
B0193 01
The voltage at the HVAC control module output to the blower motor
control module is always high.
B0193 06
The voltage at the HVAC control module output to the blower motor
control module is always low or floating.
Action Taken When the DTC Sets
The blower motor is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
HVAC Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. |
Ignition OFF, disconnect the
X1 harness connector at the K8 Blower Motor Control Module,
ignition ON. |
2. |
Verify that a test lamp
illuminates between the B+ and ground circuit terminal 5 X1.
|
⇒ If the test lamp
does not illuminate
Repair the open/high resistance in
the circuit. ⇓ If
the test lamp illuminates
3. |
Verify that a test lamp
illuminates between the B+ circuit terminal 6 X1 at the K8 Blower
Motor Control Module harness connector and ground. |
⇒ If the test lamp
does not illuminate and the circuit fuse is good
|
3.2 |
Test for less than 2 Ω
in the B+ circuit end to end. |
⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
⇒ |
If less than 2 Ω, verify the fuse is not open and there
is voltage at the fuse. |
⇒ If the test lamp
does not illuminate and the circuit fuse is open
|
3.2 |
Test for infinite resistance
between the B+ circuit and ground. |
⇒ |
If less than infinite resistance, repair the short to ground on
the circuit. |
|
3.3 |
Disconnect the X2 harness
connector at the K8 Blower Motor Control Module. |
|
3.4 |
Test for infinite resistance
between the B+ circuit terminal 1 X2 and ground. |
⇒ |
If less than infinite resistance, replace the M8 Blower
Motor. |
|
3.5 |
Install a jumper wire between
the ground circuit terminal 2 X2 and ground. |
|
3.6 |
Install a 40 A fused jumper
wire between the B+ circuit terminal 1 X2 and B+ and verify the
fuse is good. |
⇒ |
If the fuse is open, replace the M8 Blower Motor. |
⇒ |
If the fuse is good, replace the K8 Blower Motor Control
Module. |
⇓ If the test lamp
illuminates
4. |
Ignition OFF, disconnect the
X2 harness connector at the K33 HVAC Control Module, ignition
ON. |
5. |
Test for less than 0.3 V
between the control circuit terminal 3 X1 at the K8 Blower Motor
Control Module harness connector and ground. |
⇒ If greater than
0.3 V
Repair the short to voltage on the
circuit. ⇓ If less
than 0.3 V
7. |
Test for infinite resistance
between the control circuit terminal 3 X1 at the K8 Blower Motor
Control Module harness connector and ground. |
⇒ If less than
infinite resistance
Repair the short to ground on the
circuit. ⇓ If
infinite resistance
8. |
Test for less than 5 Ω
between the K33 HVAC Control Module control circuit terminal 15 X2
and control circuit terminal 3 X1 at the K8 Blower Motor Control
Module harness connector. |
⇒ If 5 Ω or
greater
Repair the open/high resistance in
the circuit. ⇓ If
less than 5 Ω
9. |
Replace the K8 Blower Motor
Control Module and verify the DTC does not reset. |
⇒ If DTC
resets
Replace the K33 HVAC Control Module.
⇓ If DTC does not
reset
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|