Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC B1604-RIGHT SOLAR SENSOR CIRCUIT LOW WITH SUN SENSOR HARNESS CONNECTOR DISCONNECTED

Fig 1: Sun Sensor Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Sun Sensor harness connector.

Turn the ignition on.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and turn the ignition on.

With the scan tool, read HVAC DTCs.

Does the scan tool display: B1604-RIGHT SOLAR SENSOR CIRCUIT LOW?

Yes
1. Go To 2.
No
1. Replace the Sun Sensor in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .
CHECK (G139) SUN SENSOR NO. 2 SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Sun Sensor No. 2 Signal Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (G139) Sun Sensor No. 2 Signal circuit between ground and the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes
1. Repair the (G139) Sun Sensor No. 2 Signal circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To 3.
CHECK (G139) SUN SENSOR NO. 2 SIGNAL CIRCUIT FOR A SHORT TO (G939) SUN SENSOR RETURN CIRCUIT

Fig 3: Checking Sun Sensor No. 2 Signal & Sun Sensor Return Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (G139) Sun Sensor No. 2 Signal circuit and the (G939) Sun Sensor Return circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes
1. Repair the (G139) Sun Sensor No. 2 Signal circuit for a short to the (G939) Sun Sensor Return circuit.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the A/C Heater Control in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .