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DTC Check

DTC Check

NOTE:
- To know how to use SUZUKI scan tool in detail, refer to its operator's manual.
- If B1504 is detected when vehicle is not exposed to light (indoor, etc.), check again for DTC with light from incandescent light applied to sunload sensor, referring to Sunload Sensor Inspection. If B1504 is not detected in this check, sunload sensor is in good condition.

Using SUZUKI Scan Tool
1. Turn OFF ignition switch.
2. Connect SUZUKI scan tool to data link connector (DLC) (1) located on underside of instrument panel.

Special Tool
(A): SUZUKI scan tool






3. Apply light to sunload sensor vertically, holding incandescent light of approximately 100 W about 100 mm (3.94 in.) away from sunload sensor.
4. Turn ON ignition switch.
5. Read DTC according to instructions displayed on SUZUKI scan tool and print it or write it down. Refer to SUZUKI scan tool operator's manual for further details.
If communication between scan tool and ECM (PCM) is not possible, check if scan tool is communicable by connecting it to ECM (PCM) in another vehicle. If communication is possible in this case, scan tool is good condition. Then check data link connector and serial data line (circuit) in the vehicle with which communication was not possible.
6. After completing the check, turn ignition switch to OFF position and disconnect SUZUKI scan tool from data link connector (DLC).

Not Using SUZUKI Scan Tool (Other than LCD model)
1. Apply light to sunload sensor vertically, holding incandescent light of approximately 100 W about 100 mm (3.94 in.) away from sunload sensor.
2. Set the following selectors to specified positions respectively with turn ignition switch OFF.
- Temperature selector (1): max cool position
- Blower speed selector (2): "OFF" position

3. While pressing "B/L" (BI-LEVEL) switch (3) and "D/F" (defogger foot) switch (4) simultaneously turn ignition switch to ON position.

NOTE: For 15 seconds after ignition switch is turned on, both "REC" indicator light and "FRE" indicator light light for in-system trouble check.

4. Read DTC from flashing pattern of "FRE" indicator (5) and "REC" indicator (6) referring to DTC Table (Other than LCD model).

NOTE:
- When more than one current DTC are detected, only current DTC having the highest priority is indicated. Therefore, after troubleshooting the malfunction, current DTC check has to be performed again to see if any other current DTC(s) is detected.
- Pressing "DEF" switch (7) alternates display of current DTC and history DTC.
- "DEF" indicator light (8) remains off when display is in current DTC mode and it lights up when display is in history DTC mode.
- When more than one history DTC are detected, the highest priority history DTC is shown. The second priority DTC can be shown by pressing air intake selector.






5. After completing above check, turn ignition switch to "OFF" position.

NOTE: HVAC control module returns to a original state at the following conditions.
- Ignition switch turned to "OFF" position
- Temperature selector is operated
- Blower speed selector is operated
- 5 minutes have passed since HVAC control unit started DTC display

Not Using SUZUKI Scan Tool (LCD model)

Current DTC
1. Apply light to sunload sensor vertically, holding incandescent light of approximately 100 W about 100 mm (3.94 in.) away from sunload sensor.
2. Turn ON ignition switch.
3. Set temperature selector (1) to 25 °C (72 °F).
4. Push "AUTO" switch (2) and "DEF" switch (3) simultaneously.

NOTE: Step 3) and 4) must be finished within 15 seconds after completed Step 2).

5. Check for DTC (4) displayed on LCD referring to DTC Table (LCD model).






NOTE:
- If DTC is checked within 10 seconds after ignition switch ON, "- - -" (5) is displayed on LCD for a few seconds. This shows system check status of HVAC control module.






- If HVAC control module detects DTC, DTC is displayed on LCD for about 3 minutes continuously.
- If no abnormality is detected, "END" (1) is displayed on LCD for about 3 minutes continuously.
- When HVAC control module detects 2 or more DTC, each one is displayed once starting from the one of higher priority order.
- DTC is displayed on LCD by following display step.
a. Higher priority DTC displays for 4 seconds.
b. No DTC displays for 0.5 second.
c. Next priority DTC displays for 4 seconds.
d. No DTC displays for 0.5 second.
e. As well as above description, all detected DTC is displayed.
f. After all detected DTC is displayed, "END" is displayed for 4 seconds.
g. DTC display is repeated in same step for about 3 minutes.






- HVAC control module cancels DTC display at any of following conditions.
- Ignition switch is turned to "OFF" position.
- Both "AUTO" switch and "DEF" switch is pushed simultaneously.

6. After completing above check, turn ignition switch to "OFF" position.

History DTC
1. Turn ON ignition switch.
2. Set temperature selector (1) to 25 °C (72 °F).
3. Push "AUTO" switch (2) and "MODE" selector (3) simultaneously.

NOTE: Step 2) and 3) must be finished within 15 seconds after completed Step 2).

4. Check for DTC (4) referring to DTC Table (LCD model).

NOTE:
- If history DTC is stored in HVAC control module, "FAN" display (5) and history DTC were displayed on LCD for about 3 minutes continuously.
- If no history DTC is stored in its memory, "FAN" display (5) and "END" (1) is displayed on LCD for about 3 minutes continuously.
- When HVAC control module has stored 2 or more history DTC, each one is displayed once starting from the one of higher priority order.






- History DTC is displayed on LCD by following display step.
a. Higher priority DTC displays for 4 seconds.
b. No DTC displays for 0.5 second.
c. Next priority DTC displays for 4 seconds.
d. No DTC displays for 0.5 second.
e. As well as above description, all detected DTC is displayed.
f. After all detected DTC is displayed, "END" is displayed for 4 seconds.
g. DTC display is repeated in same step for about 3 minutes.






- HVAC control module cancels history DTC display at any of following conditions.
- Ignition switch is turned to "OFF" position.
- Both "AUTO" switch and "MODE" selector is pushed simultaneously.

5. After completing above check, turn ignition switch to "OFF" position.
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