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Symptom: B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESH- When Monitored and Set Condition: B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESHOLD When Monitored: With the engine running. Set Condition: This DTC will set if the DCHA’s power supply voltage drops below 10.0 volts for longer than 20 seconds. POSSIBLE CAUSES FIELD MODE TEST RUN WITH THE ENGINE OFF VEHICLE’S BATTERY SYSTEM VEHICLE’S CHARGING SYSTEM NOT OPERATING PROPERLY DCHA CONTROL UNIT FAULT FUSED B+ CIRCUIT HIGH RESISTANCE DCHA CONTROL UNIT FAULT TEST ACTION APPLICABILITY 1 WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH All Yes → Rerun the Field Mode Test exactly as it is described in Test 4 of the Cabin Heater Pre-Test. If DTC B1802 resets, Go To Test #2 of No → Go To 2 291 CABIN HEATER |