Air Bag Indicator Circuit Malfunction (Passenger)
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Passenger Air Bag OFF Indicator Control
|
2
|
2*
|
4
|
-
|
Passenger Air Bag ON Indicator Control
|
3
|
3*
|
5
|
-
|
Passenger Air Bag Disable Indicator Ground
|
-
|
1
|
1
|
-
|
1. Both indicators always OFF
2. The OFF indicator will not illuminate
3. The ON indicator will not illuminate
4. The OFF indictor always ON
5. The ON indicator always ON
* High resistance may cause the appropriate indicator to
illuminate less bright than normal
|
|
|
Circuit/System Description
The passenger air bag ON/OFF indicators are used to notify the
driver when the instrument panel inflator module is enabled or
disabled . When the sensing and diagnostic module (SDM) receives
the signal from the passenger presence sensor indicating someone is
sitting in the passenger seat, the SDM will then provide voltage to
the appropriate indicator.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Note: The passenger air bag
ON and OFF indicators may not operate as expected if there are
supplemental inflatable restraint (SIR) DTCs. Repair all SIR DTCs
before proceeding with this diagnostic.
2. |
The passenger seat
unoccupied. |
3. |
Verify the scan tool Passenger
Seat Occupancy Status parameter displays Empty. |
⇒ If Passenger Seat
Occupancy Status parameter does not display Empty.
⇒ Refer to Circuit/System
Testing
⇓ If Passenger
Seat Occupancy Status parameter displays Empty.
4. |
The passenger seat
unoccupied. |
5. |
Verify the passenger air bag
OFF indicator is illuminated. |
⇒ If passenger air
bag OFF indicator is not illuminated.
⇒ Refer to Circuit/System
Testing
⇓ If passenger
air bag OFF indicator is illuminated.
6. |
The passenger seat
occupied. |
7. |
Verify the scan tool Passenger
Seat Occupancy Status parameter displays Occupied. |
⇒ If the scan tool
Passenger Seat Occupancy Status parameter does not display
Occupied.
⇒ Refer to Circuit/System
Testing
⇓ If the scan
tool Passenger Seat Occupancy Status parameter displays
Occupied.
8. |
With the passenger seat
occupied. |
9. |
Verify the passenger air bag
ON indicator is illuminated. |
⇒ If passenger air
bag ON indicator is not illuminated.
⇒ Refer to Circuit/System
Testing
⇓ If passenger
air bag ON indicator is illuminated.
Circuit/System Testing
Note: removing connectors
inspect for damage or corrosion. Damage or corrosion in the
following requires repair or replacement of the affected.
• |
S26 Hazard warning
switch. |
• |
S26 Hazard warning
switch wiring harness. |
2. |
Disconnect the harness
connector at the S26 Hazard Warning Switch. |
3. |
Test for less than 5 Ω
between the ground circuit terminal 1 and ground. |
⇒ If 5 Ω or
greater
|
3.2 |
Disconnect the harness
connector at the K36 SDM. |
|
3.3 |
Test for less than 2 Ω
in the low reference circuit end to end. |
⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
⇒ |
If less than 2 Ω, replace the K36 SDM. |
⇓ If less than 5
Ω
5. |
The passenger seat
occupied. |
6. |
Test for less than 11 V
between the control circuit terminal 2 and ground. |
⇒ If 11 V or
greater
|
6.2 |
Disconnect the harness
connector at the K36 SDM. |
|
6.4 |
Test for less than 1 V between
the control circuit and ground. |
⇒ |
If 1 V or greater, repair the short to voltage on the
circuit. |
⇒ |
If less than 1 V, replace the K36 SDM. |
⇓ If less than 11
V
7. |
The passenger seat
unoccupied. |
8. |
Test for greater than 25
Ω between the control circuit terminal 2 and ground.
|
⇒ If 25 Ω or
less
|
8.1 |
Disconnect the harness
connector at the K36 SDM. |
|
8.2 |
Test for infinite resistance
between the control circuit and ground. |
⇒ |
If less than infinite resistance, repair the short to ground on
the circuit. |
|
8.3 |
Test for less than 2 Ω
in each control circuit end to end. |
⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
⇒ |
If less than 2 Ω, replace the K36 SDM. |
⇓ If greater than 25
Ω
9. |
The passenger seat
unoccupied. |
10. |
Test for less than 11 V
between the control circuit terminal 3 and ground. |
⇒ If 11 V or
greater
|
10.2 |
Disconnect the harness
connector at the K36 SDM. |
|
10.4 |
Test for less than 1 V between
the control circuit and ground. |
⇒ |
If 1 V or greater, repair the short to voltage on the
circuit. |
⇒ |
If less than 1 V, replace the K36 SDM. |
⇓ If less than 11
V
11. |
The passenger seat
occupied. |
12. |
Test for greater than 25
Ω between the control circuit terminal 3 and ground.
|
⇒ If 25 Ω or
less
|
12.1 |
Disconnect the harness
connector at the K36 SDM. |
|
12.2 |
Test for infinite resistance
between the control circuit and ground. |
⇒ |
If less than infinite resistance, repair the short to ground on
the circuit. |
|
12.3 |
Test for less than 2 Ω
in each control circuit end to end. |
⇒ |
If 2 Ω or greater, repair the open/high resistance in the
circuit. |
⇒ |
If less than 2 Ω, replace the K36 SDM. |
⇓ If greater than 25
Ω
13. |
Replace the S26 Hazard Warning
Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Hazard Warning Switch Replacement
Control Module References for SDM replacement, setup, and
programming
|