Suzuki XL7 2007 Service Manual page 2381

Backup Lamps Malfunction
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: "
Diagnostic Fault Information
Circuit
Backup Lamps Voltage Supply
1. Backup Lamps Inoperative
Circuit/System Description
When the PRNDL is placed in the REVERSE position, a
GMLAN signal is sent from the transmission control
module (TCM) to the body control module (BCM). The
BCM then applies voltage through the backup lamps
voltage supply circuit to the back up lamps.
Reference Information
Schematic Reference
"Exterior 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 Output Controls - Lighting"
• "Scan Tool Data List - Lighting"
• "Scan Tool Data Definitions - Lighting"
Circuit/System Verification
Ignition ON, place the PRNDL in the REVERSE position.
The backup lamps should illuminate.
Short to Open/High
Ground Resistance
B2530 1
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the appropriate tail lamp assembly.
2. Test for less than 1.0 ohm of resistance between the
ground circuit terminal B and ground.
➢ If greater than the specified range, test the ground
circuit for an open/high resistance.
3. Connect a test lamp between the voltage supply
circuit terminal A and the ground circuit terminal B.
4. Ignition ON, place the PRNDL in the reverse
position. The test lamp should turn ON and OFF
when changing between park and reverse.
➢ If the test lamp is always ON, test the control circuit
for a short to voltage. If the circuit tests normal,
replace the body control module.
➢ If the test lamp is always OFF, test the control
circuit for a short to ground or an open/high
resistance. If the circuit tests normal, replace the
body control module.
5. If all circuits test normal, test or replace the
appropriate component.
Repair Instructions
NOTE
Always perform the "Diagnostic Repair
Verification - Vehicle Diagnostic Information:
" after completing the diagnostic procedure.
• "Tail Lamp Bulb Replacement"
• "Tail Lamp Replacement"
• "Rearview Mirror Replacement: "
• "Control Module References: " for BCM replacement,
setup, and programming
Lighting Systems:
Signal
Short to Voltage
Performance
1
9B-60
—