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Automatic Lamp Control Inoperative

WARNING: This page is about a different car, the 2004 Saturn Ion Red Line, 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Automatic Lamp Control Inoperative

Step Action Yes No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics 
Connector End View Reference: Lighting Systems Connector End Views 
1 Did you perform the Diagnostic System Check - Lighting System? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2
  1. Cover the ambient light sensor.
  2. Place the headlamp switch in the OFF position.
  3. Turn ON the ignition, with the engine OFF.
  4. Wait 20 seconds.
Do the headlamps and park lamps illuminate?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Are both the headlamps and park lamps inoperative in the AUTO position? Go to Step 4  Go to Step 5 
4
  1. Connect a scan tool.
  2. Observe the Automatic Lamp Control (ALC) Sensor parameter in the Exterior Lighting data list.
Is the parameter 3.66 volts or greater?
Go to Step 20  Go to Step 19 
5 Are only the headlamps inoperative in the AUTO position? Go to Step 6  Go to Step 11 
6 Do the headlamps operate properly when the headlamp switch is placed in the HEAD position? Go to Step 7  Go to Headlamps Inoperative - Low Beams 
7
  1. Disconnect the headlamp relay.
  2. Connect a 15-amp fused jumper wire between the headlamp switch signal circuit of the headlamp relay and a good ground.
Do the headlamps illuminate?
Go to Step 8  Go to Step 16 
8 Probe the headlamp relay control circuit of the headlamp relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
Go to Step 9  Go to Step 17 
9 Connect a test lamp between the headlamp relay control circuit of the headlamp relay and the coil side ground circuit of the headlamp relay.
Does the test lamp illuminate?
Go to Step 10  Go to Step 24 
10 Connect a test lamp between the headlamp relay control circuit of the headlamp relay and the switch side ground circuit of the headlamp relay.
Does the test lamp illuminate?
Go to Step 21  Go to Step 24 
11 Do the park lamps operate properly when the headlamp switch is placed in the PARK position? Go to Step 12  Go to Park Lamps Inoperative 
12
  1. Disconnect the ALC/PARK relay.
  2. Probe the switch side battery positive voltage circuit of the ALC/PARK relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
Go to Step 13  Go to Step 19 
13
  1. Disconnect the ALC/PARK relay.
  2. Probe the coil side battery positive voltage circuit of the ALC/PARK relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
Go to Step 14  Go to Step 19 
14 Connect a test lamp between the switch side battery positive voltage circuit of the ALC/PARK relay and the control circuit of the ALC/PARK relay.
Does the test lamp illuminate?
Go to Step 15  Go to Step 19 
15 Connect a 15-amp fused jumper wire between the switch side battery positive voltage circuit of the ALC/PARK relay and the park lamp supply voltage circuit of the ALC/PARK relay.
Do the park lamps illuminate?
Go to Step 22  Go to Step 18 
16 Test for an open or high resistance in the headlamp switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 23 
17 Test for an open, high resistance, or short to ground in the headlamp low beam relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 19 
18 Test for an open, high resistance, or short to ground in the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 19 
19 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 25 
20 Inspect for poor connections at the harness connector of the ambient light sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 26 
21 Inspect for poor connections at the headlamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 27 
22 Inspect for poor connections at the ALC/PARK relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 27 
23 Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 29  Go to Step 28 
24 Repair an open or high resistance in the ground circuit of the headlamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 29  -
25
IMPORTANT: Perform the set up procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration Body Control System.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?
Go to Step 29  -
26 Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement .
Did you complete the replacement?
Go to Step 29  -
27 Replace the appropriate relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Did you complete the replacement?
Go to Step 29  -
28 Replace the headlamp switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?
Go to Step 29  -
29 Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 2