Power Sunroof Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
B+
|
1
|
1
|
-
|
-
|
Sunroof Switch Close Signal
|
1
|
1
|
1
|
-
|
Sunroof Switch Open Signal
|
1
|
1
|
1
|
-
|
Sunroof Vent Switch Open Signal
|
1
|
1
|
1
|
-
|
Sunroof Vent Switch Close Signal
|
1
|
1
|
1
|
-
|
Sunroof Switch Low Reference
|
-
|
1
|
-
|
-
|
Sunroof Module Ground
|
-
|
1
|
-
|
-
|
1. Power Sunroof Malfunction
|
|
|
Circuit/System Description
The sunroof electrical system uses a master/slave configuration
utilizing a LIN-Bus based system for communication. The body
control module (BCM) is designated as the master, while the sunroof
control module is configured as the slave.
As the system master, the BCM uses the LIN-Bus communication bus
to enable or disable sunroof operation, communicate vehicle
information to each controller, and request sunroof movement. The
sunroof controller provide system status and diagnostic information
to the BCM for diagnostic reporting and operational purposes. The
control switches places a different resistor ladder network in the
circuit depending on the function selected. The controllers analog
to digital switch input reads the resulting voltage range and
determines the function
Reference Information
Schematic Reference
Sunroof Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Sunroof Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Sunroof
Ignition ON, press the sunroof switch to the open and close
positions. The sunroof should open and close when changing between
the commanded states.
Ventilation
Ignition ON, press the sunroof ventilation switch to the open and
close positions. The sunroof should move up and down when changing
between the commanded states.
Circuit/System Testing
Note: Because of the
accessibility of the switches, perform the switch component testing
before beginning the circuit/system testing.
1. |
Ignition OFF, disconnect the
harness connector at the K61 Sunroof Control Module. |
2. |
Test for less than 5 Ω
between the ground circuit terminal 2 and ground. |
⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
3. |
Verify that a test lamp
illuminates between the B+ circuit terminal 1 and ground.
|
⇒ |
If the test lamp does not illuminate, test the B+
circuit for a short to ground or an open/high resistance. If the
circuit tests normal and the B+ circuit fuse is open, determine if
the K61 Sunroof Control Module is causing the fuse to open. Replace
the K61 Sunroof Control Module. |
4. |
Ignition ON, verify that a
test lamp does not illuminate between the circuit terminals listed
below and ground: |
⇒ |
If the test lamp does illuminate, test the
appropriate circuit for a short to voltage. |
5. |
Ignition OFF, verify that a
test lamp does not illuminate between the circuit terminals listed
below and B+: |
⇒ |
If the test lamp does illuminate, test the
appropriate circuit for a short to ground. |
6. |
Disconnect the harness
connector at the S72 Sunroof Switch and the S88 Sunroof Ventilation
Switch. |
7. |
Test for less than 5 Ω
between the circuit terminals listed below: |
|
• |
S72 Sunroof Switch terminal 1
and K61 Sunroof Control Module terminal 3 |
|
• |
S72 Sunroof Switch terminal 4
and K61 Sunroof Control Module terminal 5 |
|
• |
S88 Sunroof Ventilation Switch
terminal 1 and K61 Sunroof Control Module terminal 3 |
|
• |
S88 Sunroof Ventilation Switch
terminal 4 and K61 Sunroof Control Module terminal 6 |
⇒ |
If greater than the specified value, test the appropriate
circuit for an open/high resistance. |
8. |
If all circuits test normal,
test or replace the K61 Sunroof Control Module. |
Component Testing
Sunroof Switch - Static Test
1. |
Ignition OFF, disconnect the
harness connector at the S72 Sunroof Switch. |
2. |
Test for 3.5-3.7 kΩ
between the signal terminal 4 and the low reference circuit
terminal 1. |
⇒ |
If not within the specified range, replace the S72
Sunroof Switch. |
3. |
Test for 430-440 Ω
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the open switch. |
⇒ |
If not within the specified range, replace the S72
Sunroof Switch. |
4. |
Test for 96-100 Ω
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the express open switch. |
⇒ |
If not within the specified range, replace the S72
Sunroof Switch. |
5. |
Test for 1.7-1.8 kΩ
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the close switch. |
⇒ |
If not within the specified range, replace the S72
Sunroof Switch. |
6. |
Test for 930-940 Ω
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the express close switch. |
⇒ |
If not within the specified range, replace the S72
Sunroof Switch. |
Sunroof Ventilation Switch - Static Test
1. |
Ignition OFF, disconnect the
harness connector at the S88 Sunroof Ventilation Switch.
|
2. |
Test for 930-940 Ω
between the signal terminal 4 and the low reference circuit
terminal 1. |
⇒ |
If not within the specified range, replace the S88
Sunroof Ventilation Switch. |
3. |
Test for 96-100 Ω
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the open switch. |
⇒ |
If not within the specified range, replace the S88
Sunroof Ventilation Switch. |
4. |
Test for 430-440 Ω
between the signal terminal 4 and the low reference circuit
terminal 1 while pressing the close switch. |
⇒ |
If not within the specified range, replace the S88
Sunroof Ventilation Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|