Not Using SUZUKI Scan Tool

WARNING: This page is about a different car, the 2004 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: In case of malfunctions related to temperature selector, blower speed selector and/or air flow selector on HVAC control module, the following procedure can not be used. However, SUZUKI scan tool can be used to perform DTC check.

Check A/C switch indicator lamp (6) for operation referring to HVAC Control Module Inspection .
Light over sunload sensor vertically with an incandescent lamp of approximately 60 W apart from about 100 mm (3.94 in.).
NOTE: If sunload sensor is not lighted over with an incandescent lamp, DTC B1504 is detected even though there is not any malfunction.
Set the following selectors to the specified positions respectively.
- Temperature selector (1): Maximum cool position
- Air flow selector (2): "AUTO" position
- Blower speed selector (3): "OFF" position
Keep A/C switch (4) and air intake switch (5) pushed at the same time, and turn ignition switch to ON position.
Read DTC from flashing pattern of A/C switch indicator.

Fig 1: Checking A/C Switch Indicator Lamp
Courtesy of SUZUKI OF AMERICA CORP.
After completing the check, turn ignition switch to OFF position.