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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting Systems (Symptoms) >> Courtesy Lamps Inoperative

Courtesy Lamps Inoperative

Courtesy Lamps Inoperative

Step Action Yes No
Schematic Reference: Interior Lights Schematics and Door Control Module Schematics in Doors
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
IMPORTANT: The sunload sensor assembly must indicate low light conditions for the interior lamps to operate.
  1. Cover the sunload sensor assembly.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the courtesy lamps.
  4. Open and close all of the doors.
  5. Turn the interior lamp switch ON and OFF.
  6. Turn OFF the ignition.
Do the courtesy lamps operate properly?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Ambient Light Status parameter in the HVAC lighting data list.
  4. Cover the sunload sensor assembly.
Does the scan tool display DARK?		 Go to Step 4  Go to Twilight Sentinel Inoperative 
4 With a scan tool, command the Courtesy Lamps ON from the rear integration module (RIM) lighting output controls data list.
Do all of the interior courtesy lamps turn ON?		 Go to Step 6  Go to Step 5 
5 Are all interior courtesy lamps inoperative? Go to Step 10  Go to Step 14 
6
  1. Turn the interior lamp switch ON.
  2. With a scan tool, observe the Courtesy Lamp Switch parameter in the instrument panel module (IPM) inputs data list.
Does the scan tool display ON?		 Go to Step 7  Go to Step 8 
7
  1. Open all the doors.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe all Door Open Switch parameters in the individual door module data lists.
Does the scan tool display OPEN for all Door Open Switch inputs?		 Go to Step 28  Go to Step 9 
8
  1. Disconnect the instrument panel (I/P) dimmer switch.
  2. Connect a 3-amp fused jumper between the courtesy lamp switch ON signal circuit and the I/P dimmer switch low reference circuit at the I/P dimmer switch harness connector.
  3. With a scan tool, observe the Courtesy Lamp Switch parameter.
Does the scan tool display ON?		 Go to Step 25  Go to Step 15 
9
  1. Turn OFF the ignition.
  2. Disconnect the inoperative door latch assembly.
  3. Connect a 3-amp fused jumper between the door open switch signal circuit of the inoperative door latch and the ground circuit of the door latch assembly.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the inoperative Door Open Switch input parameter.
Does the scan tool display OPEN for the inoperative Door Open Switch input?		 Go to Step 23  Go to Step 17 
10
  1. Turn OFF the ignition.
  2. Disconnect the interior lamp relay located in the right rear fuse block.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn the interior lamp switch ON.
  5. Probe the interior lamp relay control side supply voltage circuit with a test lamp connected to ground.
Does the test lamp illuminate?		 Go to Step 11  Go to Step 30 
11 Probe the interior lamp relay switch side supply voltage circuit with a test lamp that is connected to ground.
Does the test lamp illuminate?		 Go to Step 12  Go to Step 29 
12 Connect a test lamp between the interior lamp relay control side supply voltage circuit and the courtesy lamp relay control circuit.
Does the test lamp Illuminate?		 Go to Step 13  Go to Step 21 
13 Connect a test lamp between the switch side supply voltage circuit of the interior lamp relay and the courtesy lamp supply control circuit of the interior lamp relay.
Do the test lamp illuminate?		 Go to Step 22  Go to Step 19 
14
  1. Turn ON the courtesy lamps.
  2. Remove the inoperative courtesy lamp bulb.
  3. Connect a test lamp between the inoperative courtesy lamp supply voltage circuit and the ground circuit of the inoperative courtesy lamp.
Does the test lamp illuminate?		 Go to Step 28  Go to Step 19 
15 Test the courtesy lamp switch ON signal circuit for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 16 
16 Test the I/P dimmer switch low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 26 
17 Test the inoperative door open switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 18 
18 Test the inoperative door latch assembly ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 24 
19 Test the courtesy lamp supply voltage circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 20 
20 Test the courtesy lamp supply control circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 27 
21 Test the courtesy lamp relay control circuit for an open, high resistance, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 38  Go to Step 27 
22 Inspect for poor connections at the interior lamp 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 38  Go to Step 31 
23 Inspect for poor connections at the harness connector of the inoperative door latch assembly. 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 38  Go to Step 32 
24 Inspect for poor connections at the harness connector of the inoperative door control module. 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 38  Go to Step 33 
25 Inspect for poor connections at the harness connector of the I/P dimmer 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 38  Go to Step 34 
26 Inspect for poor connections at the harness connector of the IPM. 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 38  Go to Step 35 
27 Inspect for poor connections at the harness connector of the RIM. 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 38  Go to Step 36 
28 Inspect for poor connections at the inoperative courtesy lamp bulb. 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 38  Go to Step 37 
29 Locate and repair an open, high resistance, or short to ground in the switch side supply voltage circuit of the interior lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 38  -
30 Locate and repair an open, high resistance, or short to ground in the control side supply voltage circuit of the interior lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 38  -
31 Replace the in interior lamp relay. Refer to Wiring Repairs in Wiring Systems.
Did you complete the replacement?		 Go to Step 38  -
32 Replace the inoperative door latch assembly. Refer to Front Side Door Lock and Inside Handle Rod Replacement (w/o UA2) or Rear Side Door Latch Replacement in Doors.
Did you complete the replacement?		 Go to Step 38  -
33 Replace the inoperative door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 38  -
34 Replace I/P dimmer switch. Refer to Instrument Panel Dimmer Switch Replacement .
Did you complete the replacement?		 Go to Step 38  -
35 Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 38  -
36 Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 38  -
37 Replace the inoperative courtesy lamp bulb. Refer to Instrument Panel Courtesy Lamp Bulb Replacement - Right Side and Overhead Console Courtesy Lamp Replacement (Front) or Overhead Console Courtesy Lamp Replacement (Rear) .
Did you complete the replacement?		 Go to Step 38  -
38 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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