Dodge Nitro. Manual — part 721

With the scan tool, read DTCs.

Does the scan tool display active: B10B9-CABIN HEATER 2 CONTROL CIRCUIT HIGH?

Yes

Replace the Totally Integrated Power Module (TIPM in accordance with the service information.

Perform BODY VERIFICATION TEST - VER 1 .

No

Replace the Cabin Heater Relay 2 in accordance with the service information.

Perform BODY VERIFICATION TEST - VER 1 .

B1610-AMBIENT LIGHT SENSOR INPUT CIRCUIT LOW

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

With the ignition on.

Set Condition:

If the Ambient Light Sensor input is out of range toward the low voltage threshold.

Diagnostic Test

1) VERIFY THE DTC IS ACTIVE

Turn the ignition switch on.

With a scan tool, read and record DTCs.

With the scan tool, clear DTCs.

Turn the ignition switch off, and then on.

Using the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Possible Causes

(L24) AUTO HEADLAMPS SIGNAL CIRCUIT SHORTED TO GROUND
SUNLOAD SENSOR
A/C HEATER CONTROL

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Yes

Go to 2).

No

The condition that caused this symptom is currently not present. Check for an intermittent
condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken
wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or
contaminated terminals. Repair as necessary.

Perform BODY VERIFICATION TEST - VER 1 .

2) CHECK FOR ACTIVE DTC WITH SUNLOAD SENSOR HARNESS CONNECTOR
DISCONNECTED

Turn the ignition off.

Disconnect the Sunload 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 this DTC as active?

Yes

Go to 3).

No

Replace the Sunload Sensor in accordance with the service information.

Perform BODY VERIFICATION TEST - VER 1 .

3) CHECK (L24) AUTO HEADLAMPS 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 (L24) Auto Headlamps Signal circuit between ground and the A/C Heater
Control C1 harness connector.

Does the ohm meter read open circuit?

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Yes

Replace the A/C Heater Control in accordance with the service information.

Perform BODY VERIFICATION TEST - VER 1 .

No

Repair the (L24) Auto Headlamps Signal circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1 .

B1610-AMBIENT LIGHT SENSOR INPUT CIRCUIT PERFORMANCE

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

With the ignition on.

Set Condition:

If the Ambient Light Sensor input is out of range.

Diagnostic Test

1) ACTIVE DTC(S) PRESENT

Turn the ignition on.

With the scan tool, check for DTCs.

Does the scan tool display this DTC as active?

Yes

Go to 2).

No

The condition that caused this symptom is currently not present. Check for an intermittent

Possible Causes

(L24) AUTO HEADLAMPS SIGNAL CIRCUIT OPEN
(L24) AUTO HEADLAMPS SIGNAL CIRCUIT SHORTED TO GROUND
(C121) SENSOR GROUND OPEN
SUNLOAD SENSOR
A/C HEATER CONTROL

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken
wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or
contaminated terminals. Repair as necessary.

Perform BODY VERIFICATION TEST - VER 1 .

2) CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Disconnect the Sunload Sensor harness connector.

Measure the resistance of the (L24) Auto Headlamps Signal circuit between the Sunload Sensor harness
connector and the A/C Heater Control C1 harness connector.

Does the ohm meter read open circuit?

Yes

Repair the (L24) Auto Headlamps Signal circuit for an open.

Perform BODY VERIFICATION TEST - VER 1 .

No

Go to 3).

3) CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between ground and the (L24) Auto Headlamps Signal circuit in the A/C Heater
Control C1 harness connector.

Does the ohm meter read open circuit?

Yes

Go to 4).

No

Repair the (L24) Auto Headlamps Signal circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1 .

4) CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the (C121) Sensor Ground circuit between the Sunload Sensor harness
connector and the A/C Heater Control C1 harness connector.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro