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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting Systems (Symptoms) >> Turn Signal Lamps and/or Indicators Inoperative

Turn Signal Lamps and/or Indicators Inoperative

Turn Signal Lamps and/or Indicators Inoperative

Step Action Yes No
Schematic Reference:  Exterior Lights Schematics 
Connector End View Reference:  Master Electrical Component List  in Wiring Systems
1 Did you perform the Lighting System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems
2
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the turn signal lamps and indicators.
  3. Turn ON and OFF the right and left turn signal lamps.
Do the turn signal lamps and indicators operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Are all of the turn signals and indicators inoperative? Go to Step 5  Go to Step 4 
4 Are only the turn signal indicators inoperative? Go to Step 12  Go to Step 7 
5
  1. Turn OFF the ignition.
  2. Disconnect the turn signal/hazard flasher module.
  3. Connect a test lamp between the turn signal/hazard flasher module supply voltage circuit and a good ground.
  4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?
Go to Step 6  Go to Step 20 
6
  1. Turn OFF the ignition.
  2. Connect a test lamp between the supply voltage circuit of the turn signal/hazard flasher module and the ground circuit of the turn signal/hazard flasher module.
  3. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?
Go to Step 10  Go to Step 21 
7
  1. Turn OFF the ignition.
  2. Disconnect the inoperative turn signal bulb.
  3. Connect a test lamp between the supply voltage circuit of the inoperative turn signal bulb and the ground circuit of the inoperative turn signal bulb.
  4. Turn ON the inoperative turn signal.
Does the test lamp flash ON and OFF?
Go to Step 19  Go to Step 8 
8 Test the inoperative turn signal supply voltage circuit for a high resistance or an open. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27  Go to Step 9 
9 Test the inoperative turn signal ground circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27  Go to Step 10 
10
  1. Turn OFF the ignition.
  2. Disconnect the multifunction, turn signal switch.
  3. Connect a test lamp between the ignition 1 voltage circuit of the multifunction, turn signal switch and a good ground.
  4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?
Go to Step 11  Go to Step 22 
11
  1. Turn OFF the ignition.
  2. Reconnect the multifunction, turn signal switch.
  3. Disconnect the turn signal/hazard flasher module.
  4. Connect a test lamp between the inoperative turn signal switch signal circuit of the turn signal/hazard flasher module and a good ground.
  5. Turn ON the inoperative turn signal.
Does the test lamp illuminate?
Go to Step 16  Go to Step 13 
12
  1. Turn OFF the ignition.
  2. Disconnect the instrument panel cluster (IPC).
  3. Connect a test lamp between the turn signal lamp supply voltage circuit of the inoperative turn indicator and the IPC ground circuit.
  4. Turn ON the inoperative turn signal indicator.
Does the test lamp flash ON and OFF?
Go to Step 18  Go to Step 14 
13 Test the inoperative turn signal switch signal circuit for a high resistance or an open. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27  Go to Step 17 
14 Test the turn signal lamps supply voltage circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27  Go to Step 15 
15 Test the IPC ground circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27  Go to Step 16 
16 Inspect for poor connections at the harness connector of the turn signal/hazard flasher 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 27  Go to Step 23 
17 Inspect for poor connections at the harness connector of the multifunction, turn signal 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 27  Go to Step 24 
18 Inspect for poor connections at the harness connector of the IPC. 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 27  Go to Step 25 
19 Inspect for poor connections at the inoperative turn signal 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 27  Go to Step 26 
20 Repair the open, high resistance or short to ground in the turn signal/hazard flasher module supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27  -
21 Repair the open or high resistance in the turn signal/hazard flasher module ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27  -
22 Repair the open in the ignition 1 voltage circuit of the multifunction, turn signal switch. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27  -
23 Replace the turn signal/hazard flasher module. Refer to Hazard and Turn Signal Flasher Replacement .
Did you complete the replacement?
Go to Step 27  -
24 Replace the multifunction, turn signal switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?
Go to Step 27  -
25 Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages and Console.
Did you complete the replacement?
Go to Step 27  -
26 Replace the inoperative turn signal bulb. Refer to Park/Turn Signal Lamp Bulb Replacement and Tail Lamp Replacement
Did you complete the replacement?
Go to Step 27  -
27 Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 2