Dtc B1529 - Suzuki XL7 2007 Service Manual

9O-39 Cellular / Entertainment / Navigation / Audio:

DTC B1529

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 B1529 03: Device Voltage Reference Output Circuit Voltage Below Threshold
DTC B1529 07: Device Voltage Reference Output Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit
Remote Radio Control Supply Voltage
Remote Radio Control Signal
1. Steering Wheel Controls Inoperative
Circuit/System Description
The body control module (BCM) supplies voltage to the
audio steering wheel control multiple momentary contact
switches and monitors the return signal. Each switch is
associated to a set resistance value, when pressed a
specific voltage drop occurs through a series of resistors
unique to that switch. The BCM identifies the selection,
then sends a serial data message that is received by the
component controlled, activating the feature.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
B1529 03
The BCM senses the reference voltage above witch
voltage that is below 9.5 volts.
B1529 07
The BCM senses the reference voltage above witch
voltage that is above 16 volts.
Action Taken When the DTC Sets
The BCM will ignore the switch command.
Conditions for Clearing the DTC
• A current DTC clears when the malfunction is no
longer present.
• A history DTC clears when the module ignition cycle
counter reaches the reset threshold, without a repeat
of the malfunction.
Short to Open/High
Ground Resistance
B1529 03 B1529 03
1 1
Diagnostic Aids
• This diagnostic is for the audio steering wheel
controls.
• Before diagnosis of the steering wheel controls,
ensure the primary controls of the associated
component are functioning properly.
• Review schematic when testing switch resistance
values.
• If a single switch function is inoperative, test the
suspect switch. Refer to component testing.
Reference Information
Schematic Reference
"Steering Wheel Secondary/Configurable Control
Schematics"
Connector End View Reference
• "Secondary/Configurable Control Connector End
Views"
• "Data Communication Connector End Views: "
Description and Operation
"Steering Wheel Controls Description and Operation"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data List - Secondary and Configurable
Customer Controls"
• "Scan Tool Data Definitions - Secondary and
Configurable Customer Controls"
Signal
Short to Voltage
Performance
B1529 07
1
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