B1605

B1605-Right Solar Sensor Circuit High






For a complete wiring diagram, refer to.

Theory of Operation

The HVAC A/C Heater Control uses a variety of sensors to adjust HVAC operation to obtain optimal performance. These sensors are continuously monitored by the A/C Heater Control to assure that they are in range. If those sensors fall out of predetermined ranges a DTC will set.

• When Monitored: Continuously with the ignition on.

• Set Condition: If the Left Sun Sensor Signal 2 input voltage is greater than 4.5 volts for period of 60 seconds. This DTC has a de-maturing time of 10 seconds. If the DTCs status changes from active to stored, the DTC will stay in memory for 100 ignition cycles.






Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to => Non-DTC Based
Diagnostics. HVAC Pre-Diagnostic Troubleshooting Procedure

Test Step 1 - CHECK IF DTC IS ACTIVE

• Ignition on, engine not running.

• With the scan tool, read HVAC DTCs.

• It can take up to 60 seconds or more for this DTC to mature.

Is this DTC active?

Yes

• Go to Test Step 2 => [ Test Step 2 - CHECK THE SUN SENSOR ]

No

• Go to Test Step 6 => [ Test Step 6 - CHECK THE WIRING AND CONNECTORS ]

Test Step 2 - CHECK THE SUN SENSOR







• Turn the ignition off to the lock position.

• Disconnect the Sun Sensor harness connector.

• Connect a jumper wire between the (G139) Sun Sensor Signal 2 circuit and the (C121) Sensor Ground circuit in the Sun Sensor harness connector.

• Ignition on, engine not running.

• With the scan tool, read HVAC DTCs.

Did the DTC B1604-Right Solar Sensor Circuit Low set or is the Sun Sensor voltage below 0.5 of a volt?

Yes

• Replace the Sun Sensor.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 3 => [ Test Step 3 - CHECK THE (G139) SUN SENSOR SIGNAL CIRCUIT FOR A SHORT
TO VOLTAGE ]

Test Step 3 - CHECK THE (G139) SUN SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE







• Turn the ignition off to the lock position.

• Disconnect the jumper wire in the Sun Sensor harness connector.

• Disconnect the A/C Heater Control harness connector.

• Check connectors - Clean/repair as necessary.

• Ignition on, engine not running.

• Check the voltage of the (G139) Sun Sensor Signal 2 circuit.

Is there any voltage present?

Yes

• Repair the (G139) Sun Sensor Signal 2 circuit for an short to voltage.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 4 => [ Test Step 4 - CHECK THE (G139) SUN SENSOR SIGNAL 2 CIRCUIT FOR AN
OPEN ]

Test Step 4 - CHECK THE (G139) SUN SENSOR SIGNAL 2 CIRCUIT FOR AN OPEN







• Turn the ignition off to the lock position.

• Measure the resistance of the (G139) Sun Sensor Signal 2 circuit between the A/C Heater Control harness connector and the Sun Sensor harness connector.

Is the resistance above 1.0 Ohm?

Yes

• Repair the (G139) Sun Sensor Signal 2 circuit for an open or high resistance.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 5 => [ Test Step 5 - CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN ]

Test Step 5 - CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN







• Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control harness connector and the Sun Sensor harness connector.

Is the resistance above 1.0 Ohm?

Yes

• Repair the (C121) Sensor Ground circuit for an open or high resistance.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Replace and program the A/C Heater Control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 6 - CHECK THE WIRING AND CONNECTORS

• The conditions necessary to set the DTC are not present at this time.

• With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.

• Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

• Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes

• Repair as necessary.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Test complete.