Jeep Grand Cherokee WK. Manual — part 1745
B1602–LEFT SOLAR SENSOR CIRCUIT HIGH (ATC) (CONTINUED)
2.
CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (G39) Sun Sensor No. 1 Signal circuit.
Is the voltage above 0.2 volts?
Yes
>> Repair the (G39) Sun Sensor No. 1 Signal circuit for a
short to voltage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Replace the A/C Heater Control in accordance with the
Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
3.
CHECK (G939) SUN SENSOR RETURN CIRCUIT FUNCTION
Turn the ignition off.
Connect a jumper wire between the (G39) Sun Sensor No. 1 Signal
circuit and the (G939) Sun Sensor Return circuit in the Sun Sensor
harness connector.
Turn the ignition on.
With the scan tool in HVAC, select Data Display and read the Left
Solar Sensor voltage.
Is the voltage below 0.2 volts?
Yes
>> Replace the Sun Sensor in accordance with the Service
Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 4
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B1602–LEFT SOLAR SENSOR CIRCUIT HIGH (ATC) (CONTINUED)
4.
CHECK (G939) SUN SENSOR RETURN CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance of the (G939) Sun Sensor Return circuit
between the Sun Sensor harness connector and the A/C Heater Con-
trol C1 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the A/C Heater Control in accordance with the
Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Repair the (G939) Sun Sensor Return circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
5.
CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance of the (G39) Sun Sensor No. 1 Signal circuit
between the Sun Sensor harness connector and the A/C Heater Con-
trol C1 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the A/C Heater Control in accordance with the
Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Repair the (G39) Sun Sensor No. 1 Signal circuit for an
open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 329
B1604–RIGHT SOLAR SENSOR CIRCUIT LOW (ATC)
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B1604–RIGHT SOLAR SENSOR CIRCUIT LOW (ATC) (CONTINUED)
For the Automatic Temperature Control (ATC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With ignition on.
•
Set Condition:
If the Right Sunload Sensor input is out of range toward the low voltage threshold.
Possible Causes
(G139) SUN SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND
(G139) SUN SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO (G939) SUN SENSOR RETURN CIRCUIT
SUN SENSOR
A/C HEATER CONTROL
NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC
is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures.
Diagnostic Test
1.
CHECK FOR DTC B1604–RIGHT SOLAR SENSOR CIRCUIT LOW WITH SUN SENSOR HARNESS
CONNECTOR DISCONNECTED
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
>> Go To 2
No
>> Replace the Sun Sensor in accordance with the Service
Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 331
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