Suzuki XL7 2007 Service Manual page 2047

Action Taken When the DTC Sets
• The SDM sets a DTC B0073.
• The SDM commands ON the AIR BAG warning lamp
via serial data communications.
Conditions for Clearing the DTC
• The condition responsible for setting the DTC no
longer exists and the scan tool Clear DTCs function is
used.
• A history DTC will clear once 255 malfunction-free
ignition cycles have occurred.
Reference Information
Schematic Reference
"Seat Belt Schematics: "
Connector End View Reference
"Seat Belt Connector End Views: "
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
• "SIR/SRS Wiring Repairs: "
Circuit/System Testing
NOTE
• The seat belt buckle sensor is not serviced
separately. The seat belt buckle with the
seat belt buckle sensor must be serviced
as a complete unit.
• When removing connectors, inspect for
damage or corrosion. Damage or
corrosion in the following requires repair
or replacement of the affected component/
connector:
– The SDM module
– The seat belt buckle sensor wiring
harness connector
– The seat belt buckle sensor
– The SDM wiring harness connector
1. Ignition OFF, disconnect the seat belt sensor
connector.
2. Test for less than 1.0 ohm of resistance between low
reference terminal B and ground.
➢ If greater than specified, test the low reference
circuit for open/high resistance. If the circuit tests
normal, replace the SDM.
3. Ignition ON. Test for 1.0 - 1.6 volts between the
signal circuit terminal A and ground.
➢ If less that the specified range, test the signal circuit
for open/high resistance or a short to ground. If the
circuit tests normal, replace the SDM.
➢ If greater that the specified range, test the signal
circuit for a short to voltage.
4. If the circuits test normal, replace the seat belt
buckle.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Front Seat Belt Buckle Replacement: "
• "Control Module References: " for SDM and PPS
replacement, setup, and programming
DTC B0081
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC B0081 0F: Passenger Presence System Erratic
DTC B0081 3A: Passenger Presence System Incorrect
Component Installed
DTC B0081 39: Passenger Presence System Internal
Electronic Failure
DTC B0081 71: Passenger Presence System Invalid
Serial Data Received
Circuit/System Description
When the ignition is turned ON, the passenger presence
system (PPS) and the inflatable restraint sensing and
diagnostic module (SDM) performs tests to diagnose
critical malfunctions within itself. When the SDM has
completed the power-up mode, the SDM will establish
communication with the PPS. The PPS will respond by
commanding both of the PASSENGER AIR BAG ON/
OFF indicators ON for 5 seconds. The SDM will then
transmit a request message to the PPS to receive the
PPS verification ID. The PPS will transmit the verification
ID to the SDM, and the SDM will compare the ID
received to data stored in memory. If the data stored in
memory does not match the information transmitted by
the PPS or the SDM detects that the PPS has set a
current DTC, the SDM will then disable the instrument
panel (I/P) module deployment loop, set DTC B0081,
and command the AIR BAG indicator ON.
Air Bag System: 8B-35