Suzuki Liana RH413, Service Manual

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7B-57 Air Conditioning System: Automatic Type
DTC B1504 (No.04): Sunload Sensor and/or its Circuit Malfunction
S3RH0A7224014
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
3 1) Check resistance between “WHT/BLK” wire terminal and
body ground.
Is resistance more than 1 M
Ω
?
Poor connection of
“WHT/BLK” wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty. “ORN/BLK” wire shorted
to ground.
4 1) With ignition switch ON position, check voltage between
“WHT/BLK” wire terminal and “BLK/RED” wire terminal
at A/C evaporator temperature sensor connector.
Is voltage about 3.5 V?
Go to Step 5. “BLK/RED” wire open,
poor connection of
“BLK/RED” wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty.
5 1) Check A/C evaporator temperature referring to “A/C
Evaporator Outlet Air Temperature Sensor Inspection”.
Is A/C evaporator temperature sensor normal?
HVAC control module
faulty. A/C evaporator
temperature sensor
faulty.
Step Action Yes No
5V
5V
PNK
YEL
G77-27
G77-10
2
1
3
10
27
I3RH0A722010-01
1. HVAC control module 2. Sunload sensor 3. HVAC control module connector “G77” (viewed from harness side)
DTC Detecting Condition Trouble Area
• Signal from sunload sensor is less than the specified (0.7 V). (The
luminosity is less than 52 W/m 2 .)
• Signal from sunload sensor is more than the specified (3.3 V). (The
luminosity is less than 4448 W/m 2 .)
• “PNK” and/or “YEL” wire faulty
• Sunload sensor faulty
• HVAC control module faulty
Step Action Yes No
1 1) Turn ignition switch OFF, and then disconnect sunload
sensor connector referring to “Sunload Sensor Removal
and Installation”.
2) Turn ignition switch ON, and then check voltage
between “PNK” wire terminal at sunload sensor
connector and body ground.
Is voltage about 5 V?
Go to Step 3. Go to Step 2.
2 1) Turn ignition switch OFF, and then disconnect HVAC
control module connector referring to “HVAC Control
Module Removal and Installation in Section 7A”.
2) Check resistance between “PNK” wire terminal at
sunload sensor connector and “PNK” wire terminal at
HVAC control module connector.
Is resistance less than 1 M
Ω
?
Go to Step 3. “PNK” wire open or high
resistance, poor
connection of “PNK”
wire terminal at HVAC
control module
connector, and/or HVAC
control module faulty.