Power Windows Malfunction - AEF/AXG Without AER
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Driver Window Motor B+
|
U1530 00, U1534 00
|
U1534 00
|
--
|
--
|
Passenger Window Motor B+
|
U1530 00, U1534 00
|
U1530 00
|
--
|
--
|
Driver Window Motor Serial Data
|
U1530 00, U1534 00
|
U1534 00
|
U1534 00
|
-
|
Passenger Window Motor Serial Data
|
U1530 00, U1534 00
|
U1534 00
|
U1534 00
|
-
|
Driver Window Motor Down Signal
|
B316B 02
|
1
|
1
|
--
|
Driver Window Motor Express Signal
|
B316B 02
|
1
|
1
|
--
|
Driver Window Motor Up Signal
|
B316B 02
|
1
|
1
|
--
|
Passenger Window Motor Down Signal
|
B317A 02
|
2
|
1
|
--
|
Passenger Window Motor Express Signal
|
B317A 02
|
2
|
1
|
--
|
Passenger Window Motor Up Signal
|
B317A 02
|
2
|
1
|
--
|
Driver Window Motor Ground
|
-
|
U1534 00
|
--
|
--
|
Passenger Window Motor Ground
|
-
|
U1530 00
|
--
|
--
|
Driver Window Switch Ground
|
--
|
1, 2
|
--
|
--
|
Passenger Window Switch Ground
|
-
|
2
|
--
|
--
|
1. Driver Window Malfunction
2. Passenger Window Malfunction
|
Circuit/System Description
The window motors are supplied with B+ voltage which is used to
power the motor and also used as a reference voltage within the
logic circuit. When the driver or passenger window switch is
pressed, a switch is closed causing the reference voltage in the
appropriate circuit in the window motor to drop, the window motor
responds by moving the window in the direction commanded.
Diagnostic Aids
Failure of a window not completely closing or a window auto
reversing when completely closed may have been caused by the
following conditions:
• |
When the window glass has been replaced |
• |
When the door has been replaced |
• |
When the window regulator has been replaced |
A relearn procedure may be necessary to correct for the above
malfunctions, refer to:
Window Regulator Motor Programming and Setup .
Reference Information
Schematic Reference
Moveable Window Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, command the driver window UP and DOWN
with a scan tool. The driver window should perform the UP, DOWN
functions.
⇒ |
If the driver window does not perform as
specified, refer to Window Motor Malfunction. |
- Command the passenger window UP and DOWN with a scan
tool. The passenger window should perform the UP, DOWN
functions.
⇒ |
If the passenger window does not perform as
specified, refer to Window Motor Malfunction. |
- Command the driver window UP, DOWN, express UP and
express DOWN by using the S79D window switch-driver. The driver
window should perform the UP, DOWN and express functions.
⇒ |
If the driver window does not perform as
specified, refer to Driver Window Switch Malfunction. |
- Command the passenger window UP, DOWN, express UP and
express DOWN by using the passenger window switch and the
appropriate switch on the S79D window switch-driver, the passenger
window should perform the UP, DOWN and express functions from each
switch.
⇒ |
If the passenger window does not perform as
specified, refer to Passenger Window Switch Malfunction. |
Circuit/System Testing
Window Motor Malfunction
- Ignition OFF for, disconnect the harness connector at
the appropriate M74 window motor.
- After 10 minutes, test for less than 10 Ω
between the ground circuit terminal 1 and ground.
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, verify that a test lamp illuminates
between the B+ circuit terminal 2 and ground.
⇒ |
If the test lamp does not illuminate, test the B+
circuit for a short to ground or an open/high resistance. |
- Test for 5 - 10 V between the serial
data circuit terminal 4 and ground.
⇒ |
If greater than the specified range, test the
serial data circuit for a short to voltage. If the circuit tests
normal, replace the K9 BCM. |
⇒ |
If less than the specified range, test the serial
data circuit for a short to ground or an open/high resistance. If
the circuit tests normal, replace the K9 BCM. |
- If all circuits test normal, replace the M74 window
motor.
Driver Window Switch Malfunction
- Ignition OFF, disconnect the harness connector at the
S79D window switch-driver.
- After 10 minutes, test for less than 10 Ω
between the ground circuit terminal 1 and ground.
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, verify that the scan tool Driver Window
Main Control Down Switch parameter is Inactive.
⇒ |
If not the specified value, test the signal
circuit terminal listed below for a short to ground. If the circuit
tests normal, replace the M74D window motor-driver. |
• |
Left hand drive terminal 3 |
• |
Right hand drive terminal 7 |
- Connect a 3 A fused jumper wire between the
signal circuit terminal listed below and ground. Verify that the
scan tool Driver Window Main Control Down Switch parameter is
Active.
• |
Left hand drive terminal 3 |
• |
Right hand drive terminal 7 |
⇒ |
If not the specified value, test the signal
circuit for a short to voltage or an open/high resistance. If the
circuit tests normal, replace the M74D window motor-driver. |
- Verify that the scan tool Driver Window Main Control
Up Switch parameter is Inactive.
⇒ |
If not the specified value, test the signal
circuit terminal listed below for a short to ground. If the circuit
tests normal, replace the M74D window motor-driver. |
• |
Left hand drive terminal 5 |
• |
Right hand drive terminal 8 |
- Connect a 3 A fused jumper wire between the
signal circuit terminal listed below and ground. Verify that the
scan tool Driver Window Main Control Up Switch parameter is
Active.
• |
Left hand drive terminal 5 |
• |
Right hand drive terminal 8 |
⇒ |
If not the specified value, test the signal
circuit for a short to voltage or an open/high resistance. If the
circuit tests normal, replace the M74D window motor-driver. |
- Verify the scan tool Driver Window Main Control
Express Switch parameter is Inactive.
⇒ |
If not the specified value, test the signal
circuit terminal listed below for a short to ground. If the circuit
tests normal, replace the M74 driver window motor. |
• |
Left hand drive terminal 2 |
• |
Right hand drive terminal 6 |
- Connect a 3 A fused jumper wire between the
signal circuit terminal listed below and ground, verify the scan
tool Driver Window Main Control Express Switch parameter is
Active.
• |
Left hand drive terminal 2 |
• |
Right hand drive terminal 6 |
⇒ |
If not the specified value, test the signal
circuit terminal for a short to voltage or an open/high resistance.
If the circuit tests normal, replace the M74 driver window
motor. |
- If all circuits test normal, replace the
S79D window switch-driver.
Passenger Window Switch Malfunction
- Ignition OFF, disconnect the harness connector at the
S79P window switch-passenger.
- After 10 minutes, test for less than 10 Ω
between the ground circuit terminal 1 and ground.
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Disconnect the harness connector at the S79D window
switch-driver.
- Ignition ON, verify that the scan tool Passenger
Window Switch at Door parameter is Inactive.
⇒ |
If the value is Up, test the signal circuit
terminal 8 for a short to ground. If the circuit tests normal,
test or replace the M74P window motor-passenger. |
⇒ |
If the value is Down, test the signal circuit
terminal 7 for a short to ground. If the circuit tests normal,
test or replace the M74P window motor-passenger. |
⇒ |
If the value is Express, test the signal circuit
terminal 6 for a short to ground. If the circuit tests normal,
test or replace the M74P window motor-passenger. |
- Connect a 3 A fused jumper wire between the
signal circuit terminal 8 and ground, verify that the scan
tool Passenger Window Switch at Door parameter is Up.
⇒ |
If not the specified value, test the signal
circuit for a short to voltage or an open/high resistance. If the
circuit tests normal, replace the M74P window motor-passenger. |
- Connect a 3 A fused jumper wire between the
signal circuit terminal 7 and ground, verify that the scan
tool Passenger Window Switch at Door parameter is Down.
⇒ |
If not the specified value, test the signal
circuit for a short to voltage or an open/high resistance. If the
circuit tests normal, replace the M74P window motor-passenger. |
- Connect a 3 A fused jumper wire between the
signal circuit terminal 6 and ground, verify that the scan
tool Passenger Window Switch at Door parameter is Express.
⇒ |
If not the specified value, test the signal
circuit terminal for a short to voltage or an open/high resistance.
If the circuit tests normal, replace the M74 passenger window
motor. |
- Ignition OFF, connect the harness connector at the
S79D window switch-driver.
- Ignition ON, observe the scan tool Passenger Window
Switch at Door parameter while using the appropriate switch on the
S79D window switch-driver. The parameters should change from
Inactive to Up, Down and Express.
⇒ |
If the values do not change, test or replace the
S79D window switch-driver. |
- If all circuits test normal, test or replace the S79P
window switch-passenger.
Component Testing
Driver Window Switch
- Ignition OFF, disconnect the harness connector at the
S79D window switch-driver.
- With the switch in the INACTIVE position, test for
infinite resistance between the signal terminals listed below and
the ground terminal 1:
⇒ |
If less than the specified value, replace the S79D
window switch-driver. |
- With the switch in the UP position, test for less than
2 Ω between the signal terminal listed below and the ground
terminal 1:
⇒ |
If greater than the specified range, replace the
S79D window switch-driver. |
- With the switch in the DOWN position, test for less
than 2 ohms between the signal terminal listed below and the ground
terminal 1:
⇒ |
If greater than the specified range, replace the
S79D window switch-driver. |
Passenger Window Switch
- Ignition OFF, disconnect the harness connector at the
S79P window switch-passenger.
- Test for infinite resistance between the signal
terminals 6, 7 and 8 and the ground terminal 1 with the switch in
the INACTIVE position.
⇒ |
If less than the specified value, replace the S79P
window switch-passenger |
- Test for less than 2 Ω between the signal
terminal 8 and the ground terminal 1 with the switch in the UP
position.
⇒ |
If greater than the specified range, replace the
S79P window switch-passenger. |
- Test for less than 2 Ω between the signal
terminal 7 and the ground terminal 1 with the switch in the DOWN
position.
⇒ |
If greater than the specified range, replace the
S79P window switch-passenger. |
- Test for less than 2 Ω between the signal
terminal 6 and the ground terminal 1 with the switch in the EXPRESS
DOWN position
⇒ |
If greater than the specified range, replace the
S79P window switch-passenger. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Front Side Door Window Switch Replacement - Right Side
Front Side Door Window Switch Replacement - Left Side
Front Side Door Window Regulator Motor Replacement
Control Module References for BCM replacement, setup and
programming
|