DTC Troubleshooting

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When DTC B1502, B1503, B1512 and B1530 are indicated together, it is possible that "BLK/RED" wire circuit open.

DTC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Position sensor power supply circuit check Disconnect temperature control actuator connector with ignition switch turned OFF. Check for proper connection to temperature control actuator at "RED/WHT", "WHT/RED" and "BLK/RED" wire terminals. If OK, measure voltage between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 4 - 6 V?	Go to Step 6.	Go to Step 2.
2	Position sensor power supply circuit check Disconnect air flow control actuator connector with ignition switch turned OFF. Measure voltage between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 4 - 6 V?	Air flow control actuator faulty.	Go to Step 3.
3	Position sensor power supply circuit check Disconnect air intake control actuator connector with ignition switch turned OFF. Measure voltage between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 4 - 6 V?	Air intake control actuator faulty.	Go to Step 4.
4	Position sensor power supply circuit check Disconnect connector from HVAC control module with ignition switch turned OFF. Check for proper connection to HVAC control module connector at "G52-14", "G52-27" and "G52-21" terminals. If OK, measure resistance between "RED/WHT" wire terminal of temperature control actuator connector and "G52-14" terminal of HVAC control module connector. Is resistance below 5 Ω?	Go to Step 5.	"RED/WHT" wire open or high resistance circuit.
5	Position sensor power supply circuit check Measure resistance between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground. Is resistance infinity?	Go to Step 6.	"RED/WHT" wire shorted to ground circuit.
6	Position sensor power supply circuit check Measure voltage between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 0 V?	Go to Step 7.	"RED/WHT" wire shorted to other circuit.
7	Position sensor signal circuit check Connect HVAC control module connector with ignition switch turned OFF. Measure voltage between "WHT/RED" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 4 - 6 V?	Go to Step 11.	Go to Step 8.
8	Position sensor signal circuit check Disconnect connector from HVAC control module with ignition switch turned OFF. Measure resistance between "WHT/RED" wire terminal of temperature control actuator connector and "G52-21" terminal of HVAC control module connector. Is resistance below 5 Ω?	Go to Step 9.	"WHT/RED" wire open or high resistance circuit.
9	Position sensor signal circuit check Measure resistance between "WHT/RED" wire terminal of temperature control actuator connector and vehicle body ground. Is resistance infinity?	Go to Step 10.	"WHT/RED" wire shorted to ground circuit.
10	Position sensor signal circuit check Measure voltage between "WHT/RED" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON. Is voltage 0 V?	Go to Step 11.	"WHT/RED" wire shorted to other circuit.
11	Position sensor ground circuit check Connect HVAC control module connector with ignition switch turned OFF. Measure resistance between "BLK/RED" wire terminal of temperature control actuator connector and vehicle body ground. Is resistance below 5 Ω?	Go to Step 13.	Go to Step 12.
12	Position sensor ground circuit check Measure resistance between "G52-13" terminal of HVAC control module connector and vehicle body ground. Is resistance below 5 Ω?	"BLK/RED" wire open or high resistance circuit.	HVAC control module faulty.
13	Temperature control actuator check Check temperature control actuator referring to TEMPERATURE CONTROL ACTUATOR INSPECTION . Is it in good condition?	HVAC control module faulty.	Temperature control actuator faulty.