Dtc B1504: Sunload Sensor And/Or Its Circuit Malfunction - Suzuki GRAND VITARA Owner's Manual

7B-33 Air Conditioning System:

DTC B1504: Sunload Sensor and/or Its Circuit Malfunction

Wiring Diagram
2
[A]: HVAC control module connector "G52" (harness side view)
DTC Detecting Condition and Trouble Area
Sunload sensor signal voltage is more than or less than specified value for
specified time continuously.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
DTC Troubleshooting
Step
1 Sunload sensor power supply circuit check
1) Disconnect sunload sensor connector with ignition
switch turned OFF.
2) Check for proper connection to sunload sensor at "PNK"
and "YEL" wire terminals.
3) If OK, measure voltage between "PNK" wire terminal of
sunload sensor connector and vehicle body ground with
ignition switch turned ON.
Is voltage 4 – 6 V?
2 Sunload sensor power supply circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at "G52-12" and "G52-18" terminals.
3) If OK, measure resistance between "PNK" wire terminal
of sunload sensor connector and "G52-12" terminal of
HVAC control module connector.
Is resistance below 5
3 Sunload sensor power supply circuit check
1) Measure resistance between "PNK" wire terminal of
sunload sensor connector and vehicle body ground.
Is resistance infinity?
4 Sunload sensor power supply circuit check
1) Measure voltage between "PNK" wire terminal of
sunload sensor connector and vehicle body ground with
ignition switch turned ON.
Is voltage 0 V?
1
5V
PNK G52-18
YEL G52-12
DTC Detecting Condition
Action
Ω
?
[A]
12
1. HVAC control module
• Sunload sensor circuit
• Sunload sensor
• HVAC control module
Yes
Go to Step 5.
Go to Step 3.
Go to Step 4.
Go to Step 5.
S5JB0A7204035
18
I5JB0A720022-01
2. Sunload sensor
Trouble Area
No
Go to Step 2.
"PNK" wire open or high
resistance circuit.
"PNK" wire shorted to
ground circuit.
"PNK" wire shorted to
other circuit.