Suzuki XL7 2007 Service Manual page 911

Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the battery current sensor.
2. Ignition OFF, test for less than 1.0 ohm of resistance
between the low reference circuit terminal B and
ground.
➢ If the greater than the specified range, test the low
reference circuit for an open/high resistance. If the
circuit tests normal replace the BCM.
3. Ignition ON, test for 4.8- 5.2 volts between the
battery current sensor supply voltage circuit terminal
A and ground.
➢ If less than the specified range, test the supply
voltage circuit for a short to ground or an open/high
resistance. If the circuit test normal replace the
BCM.
➢ If greater than specified range, test the supply
voltage circuit for a short to voltage.
4. Ignition ON, test for 4.8-5.2 volts between the battery
current sensor signal circuit terminal C and ground.
➢ If less than the specified range, test the signal
circuit for a short to ground or an open/high
resistance. If the circuit test normal replace the
BCM.
➢ If greater than specified range, test the signal circuit
for a short to voltage.
5. If all circuits test normal test or replace the battery
current sensor.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Control Module References: " for BCM replacement,
setup, and programming
• "Battery Current Sensor Replacement"
DTC B1424
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 Descriptor
DTC B1424: Device 1 Voltage Low
Circuit/System Description
Voltage at theft deterrent module is lower than the
voltage being reported on the serial data line.
Conditions for Running the DTC
The ignition must be ON for this code to set.
Conditions for Setting the DTC
Module battery voltage between low voltage limits 6-9
volts for a minimum of 2 seconds and serial data voltage
is greater than normal low voltage 9 volts.
Action Taken When the DTC Sets
Security telltale ON.
Conditions for Clearing the DTC
Module battery voltage is greater than normal voltage
low limit 9 volts.
Reference Information
Schematic Reference
"Immobilizer Schematics: "
Connector End View Reference
"Immobilizer Connector End Views: "
Description and Operation
"Immobilizer Description and Operation: "
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the theft deterrent module (TDM).
2. Ignition OFF, test for less than 1.0 ohm of resistance
between the ground circuit terminal 3 and ground.
➢ If greater than the specified range, test the ground
circuit for an open/high resistance. If the circuit
tests normal replace the TDM.
3. Measure and record the voltage at the battery
terminals. Ignition ON, measure the voltage between
the ignition voltage circuit terminal 2 and ground.
Verify that the voltage readings do not differ more
than 1 volt.
➢ If greater than specified value, test the ignition
voltage circuit for a short to ground or an open/high
resistance. If the circuits test normal, replace the
TDM.
4. Refer to "Charging System Test".
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
"Control Module References: " for TDM replacement,
setup, and programming
Charging System: 1J-18