Suzuki XL7 2007 Service Manual page 2382

9B-61 Lighting Systems:
Courtesy Lamps Always On
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.
Diagnostic Fault Information
Circuit
Door Ajar Switch Voltage Supply Circuit
Dome Lamp Switch
BCM
Door Ajar Switch
1. Courtesy Lamps Always ON
2. Courtesy Lamps Inoperative
Circuit/System Description
The courtesy lamps are controlled by the body control
module (BCM). Inputs from the dome lamp switch and
the door ajar switches are monitored by the BCM. When
a door ajar switch is closed the BCM supplies the ground
for the courtesy lamps or the dome lamp switch is turned
to the ON position. The BCM also supplies the voltage
for the courtesy lamps.
Diagnostic Aids
• Check for the proper operation of the courtesy lamp
bulbs.
• Check the position of the dome lamp switch.
Reference Information
Schematic Reference
"Interior Lights Schematics"
Connector End View Reference
"Lighting Systems Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data Definitions - Lighting"
• "Scan Tool Data List - Lighting"
• "Scan Tool Output Controls - Lighting"
Short to Open/High
Ground Resistance
1 2
1 2
1 2
1 2
Circuit/System Verification
Ignition ON, observe the Scan Tool Door Lamp
Command parameter while OPENING and CLOSING
the drive door. The reading should change between OFF
and ON.
Circuit/System Testing
Dome Lamp Switch Circuit Testing
1. Ignition OFF, disconnect the harness connector at
the dome lamp switch.
2. Ignition OFF, test for less than 1 ohm of resistance
between the ground circuit and ground.
➢ If greater than 1 ohm, test the ground circuit for an
open/high resistance.
3. Verify the scan tool dome lamp command parameter
is OFF.
➢ If the dome lamp command is not OFF, test the
signal circuit for a short to ground. If the circuit tests
normal, replace the BCM.
4. If all circuits test normal, test or replace the dome
lamp switch.
NOTE: This test can be performed on any of the door
ajar switches.
Door Ajar Switch Circuit Testing
1. Ignition OFF, disconnect the harness connector at
the inoperative door ajar switch.
2. Ignition OFF, test for less than 1 ohm of resistance
between the ground circuit and ground.
➢ If greater than 1 ohm, test the ground circuit for an
open/high resistance.
3. Verify the scan tool dome lamp command parameter
is OFF.
➢ If the dome lamp command is not OFF, test the
signal circuit for a short to ground. If the circuit tests
normal, replace the BCM.
4. If all circuits test normal, test or replace the door ajar
switch.
Signal
Short to Voltage
Performance
—
—
2
2
—
—
—
—