Jeep Grand Cherokee WK. Manual — part 1744
B1601–LEFT 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 Left Sunload Sensor input is out of range toward the low voltage threshold.
Possible Causes
(G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND
(G39) SUN SENSOR NO. 1 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 B1601–LEFT 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: B1601–LEFT SOLAR SENSOR CIR-
CUIT 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).
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B1601–LEFT SOLAR SENSOR CIRCUIT LOW (ATC) (CONTINUED)
2.
CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
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 ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (G39) Sun Sensor No. 1 Signal circuit for a
short to ground.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 3
3.
CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO (G939) SUN SENSOR RETURN
CIRCUIT
Measure the resistance between the (G39) Sun Sensor No. 1 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
>> Repair the (G39) Sun Sensor No. 1 Signal circuit for a
short to the (G939) Sun Sensor Return circuit.
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).
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 325
B1602–LEFT SOLAR SENSOR CIRCUIT HIGH (ATC)
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B1602–LEFT SOLAR SENSOR CIRCUIT HIGH (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 Left Sunload Sensor input is out of range toward the high voltage threshold.
Possible Causes
(G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT OPEN
(G939) SUN SENSOR RETURN CIRCUIT OPEN
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 (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Sun Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (G39) Sun Sensor No. 1 Signal circuit.
What voltage is present?
Above 5.2 Volts
Go To 2
4.8 Volts to 5.2 Volts
Go To 3
Below 4.8 Volts
Go To 5
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 327
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