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Dtc B1570: Engine Type Signal Failure; Dtc B1571: Combination Meter Spec Signal Failure - Suzuki SX4 Service Manual

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7B-72 Air Conditioning System: Automatic Type

DTC B1570: Engine Type Signal Failure

DTC Detecting Condition and Trouble Area
HVAC control module receives invalid data of engine type signal from BCM. • CAN communication circuit
DTC Troubleshooting
Step
1
Was "Air Conditioning System Check" performed?
2
Scan tool data check
1) Connect scan tool with ignition switch turned OFF
position.
2) Ignition switch turned ON and select "DATA LIST" mode.
3) Check "ENGINE TYPE" displayed on scan tool.
Is value of engine type signal within specified ranges
indicated in "Scan Tool Data"?
3
Scan tool data check
1) Check "ENGINE TYPE" displayed on scan tool.
Is "CAN Err" displayed on scan tool data?

DTC B1571: Combination Meter Spec Signal Failure

DTC Detecting Condition and Trouble Area
HVAC control module receives invalid data of Combination meter spec signal
from BCM.
DTC Troubleshooting
Step
1
Was "Air Conditioning System Check" performed?
2
Scan tool data check
1) Connect scan tool with ignition switch turned OFF
position.
2) Ignition switch turned ON and select "DATA LIST" mode.
3) Check "METER SPEC" displayed on scan tool.
Is value of combination meter spec signal within specified
ranges indicated in "Scan Tool Data"?
3
Scan tool data check
1) Check "METER SPEC" displayed on scan tool.
Is "CAN Err" displayed on scan tool data?
DTC detecting condition
Action
DTC detecting condition
Action
Trouble area
• HVAC control module
• ECM
Yes
Go to Step 2.
Substitute a known
good HVAC control
module and recheck.
Check CAN
communication circuit
referring to "DTC Check
in Section 1A".
Trouble area
• CAN communication circuit
• Combination meter
• HVAC control module
Yes
Go to Step 2.
Substitute a known
good HVAC control
module and recheck.
Check CAN
communication circuit
referring to "DTC Check
in Section 1A".
S7RW0A7224027
No
Go to "Air Conditioning
System Check:
Automatic Type".
Go to step 3.
Substitute a known
good ECM and recheck.
S7RW0A7224028
No
Go to "Air Conditioning
System Check:
Automatic Type".
Go to step 3.
Substitute a known
good combination meter
and recheck.

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