Sounds like a relay in your fuse box.
The turn signal lamps may only be activated with the ignition switch in RUN or BULB TEST position. The T/SIG fuse supplies ignition voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, the turn signal switch sends an ignition voltage to the hazard lamp/turn signal flasher, which sends an on-off signal to the turn signal switch. When the turn signal switch receives the on-off signal it will send that signal to the following lamps on the LH or RH side:
• The Rear Turn Lamp
• The Turn Signal Indicator
• The Sidemarker Lamp
• The Sideview Mirror (Pontiac Thunder only)
The turn signal switch also sends a separate on-off signal to the Daytime Running Lamps (DRL) control module, which relays the signal to the appropriate front turn signal. The front turn signals are grounded at G101 and G102. The rear turn signals are grounded at G401. The sidemarker lamps are grounded through the corresponding front parklamp.
The sideview mirror turn signals are a bank of LEDs placed behind the mirror glass.
The hazard lamps operate on battery voltage. The HAZARD fuse supplies battery voltage to the turn signal switch. When the hazard switch is pressed, the turn signal switch sends battery voltage to the hazard lamp/turn signal flasher, which sends an on-off signal to the turn signal switch. The turn signal switch send the on-off signal to all the turn signal lamps, causing all the lamps to flash including both IPC turn signal indicators. The hazard lamp/turn signal flasher is grounded at G200.
When the parklamps are ON, the sidemarker lamps receive voltage from the park lamp supply voltage circuit and illuminate. The sidemarker lamp is grounded through the corresponding rear turn signal. When the turn signal switch is place in the left or right hand position, the rear turn signal illuminates and the sidemarker lamp will loose its ground, causing the sidemarker lamp to turn off when the turn signals are on and to illuminate again when the turn signal is off.
Do you know how to test automotive electrical circuit's using a DVOM - digital volt ohmmeter ? Do you know what wiring diagrams are ?
Turn Signal Lamps and/or Indicators Inoperative (Domestic)
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
Turn the ignition to the ON position, with the engine OFF.
Observe the turn signal lamps and indicators.
Place the turn signal switch in the LH and RH on position.
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 4
Go to Step 5
4
Observe the turn signal lamps and indicators.
Place the turn signal switch in the OFF position.
Place the hazard switch in the ON position.
Do the hazard lamps operate?
Go to Step 6
Go to Step 23
5
Are only the turn signal indicators inoperative?
Go to Step 7
Go to Step 9
6
Using a test lamp connected to ground, backprobe the ignition 1 voltage circuit of the C201 connector that is fed by the T/SIG fuse.
Does the test lamp illuminate?
Go to Step 31
Go to Step 20
7
Place the ignition switch in the OFF position.
Disconnect the instrument panel cluster connector.
Place the ignition switch in the ON position.
Place the turn signal switch in the appropriate on position.
With a test lamp connected to ground, probe the turn lamp supply voltage circuit of the instrument panel cluster connector.
Does the test lamp illuminate?
Go to Step 8
Go to Step 38
8
With a test lamp connected to battery positive voltage, probe the ground circuit of the instrument panel cluster connector.
Does the test lamp illuminate?
Go to Step 29
Go to Step 37
9
Determine which of the following lamps are inoperative:
• Front turn signal lamp LH or RH
• Rear turn signal lamp LH or RH
• Mirror turn signal lamp LH or RH, if equipped
Is a front turn signal lamp inoperative?
Go to Step 16
Go to Step 10
10
Is a rear turn signal lamp inoperative?
Go to Step 13
Go to Step 11
11
Disconnect the inoperative mirror turn signal.
Using a test lamp, probe between the supply voltage circuit and the ground circuit of inoperative mirror turn signal connector.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 28
Go to Step 12
12
Using a test lamp connected to ground, probe the supply voltage circuit of inoperative mirror turn signal connector.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 35
Go to Step 36
13
Remove the inoperative rear turn signal lamp bulb.
Using a test lamp, probe between the supply voltage circuit and the ground circuit of inoperative turn signal lamp bulb socket.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 27
Go to Step 14
14
Disconnect the tail lamp connector.
Using a test lamp connected to ground, probe the turn signal supply voltage circuit of the tail lamp connector.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 15
Go to Step 22
15
Using a test lamp connected to ground, probe between the turn signal supply voltage circuit and the ground circuit of the tail lamp connector.
Does the test lamp illuminate?
Go to Step 28
Go to Step 34
16
Disconnect the inoperative front turn signal lamp.
Using a test lamp connected to ground, probe the supply voltage circuit of the inoperative front turn signal lamp.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 17
Go to Step 18
17
With a test lamp, probe between the supply voltage circuit and the ground circuit of the inoperative front turn signal lamp.
Does the test lamp illuminate?
Go to Step 27
Go to Step 33
18
Place the ignition in the OFF position.
Disconnect the Daytime Running Lamps (DRL) control module connector.
Turn the ignition to the ON position, with the engine OFF.
Using a test lamp connected to ground, probe the turn signal switch signal circuit of Daytime Running Lamps (DRL) control module connector.
Place the turn signal switch in the RH or LH ON position.
Does the test lamp illuminate?
Go to Step 19
Go to Step 21
19
Connect a fused jumper between the turn signal switch signal circuit and the turn signal supply voltage circuit of the daytime running lamps control module. Refer to Circuit Testing in Wiring Systems.
Place the turn signal switch in the RH or LH ON position.
Using a test lamp connected to ground, probe the supply voltage circuit of the inoperative front turn signal lamp
Does the test lamp illuminate?
Go to Step 30
Go to Step 32
20
Test for an open or high resistance in the ignition 1 supply voltage circuit of the turn signal switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 46
Go to Step 39
21
Test for an open, high resistance or a short to ground in the turn signal switch signal circuit of the Daytime Running Lamps (DRL) control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 46
Go to Step 31
22
Test for an open or high resistance in the turn signal supply voltage circuit of the inoperative rear turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 46
Go to Step 31
23
Disconnect the turn signal/hazard flasher.
Install a jumper between the turn signal/hazard flasher voltage supply circuit and the turn signal multifunction switch flasher circuit.
Place the turn signal switch in to the TURN LEFT position.
Do the LEFT TURN signal lamps illuminate (non-flashing)?
Go to Step 24
Go to Step 25
24
Test for a short to battery positive voltage, open or a poor connection in the ground circuit of the turn signal/hazard flasher. 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 46
Go to Step 40
25
Test for a short ground, open or a poor connection in turn/hazard supply voltage circuit. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 46
Go to Step 26
26
Test for a short to ground, open or a poor connection in the turn signal flasher signal circuit. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 46
Go to Step 42
27
Inspect for poor connections at the inoperative turn signal lamp bulb socket. 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 46
Go to Step 44
28
Inspect for poor connections at the harness connector of the tail lamp or mirror turn signal. 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 46
Go to Step 43
29
Inspect for poor connections at the harness connector of the instrument panel cluster. 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 46
Go to Step 45
30
Inspect for poor connections at the harness connector of the daytime running lamps 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 46
Go to Step 41
31
Inspect for poor connections at the harness connector of the 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 46
Go to Step 42
32
Repair an open or high resistance in the supply voltage circuit of the front turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
33
Repair an open, high resistance or a short to battery positive voltage in the ground circuit of the front turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
34
Repair an open or high resistance in the ground circuit of the tail lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
35
Repair an open or high resistance in the ground circuit of the inoperative mirror turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
36
Repair an open, high resistance or a short to ground in the turn signal supply voltage circuit of the inoperative mirror turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
37
Repair an open or high resistance in the ground circuit of the inoperative turn signal indicator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
38
Repair an open or high resistance in the supply voltage circuit of the inoperative turn signal indicator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
39
Repair the short to ground in the ignition 1 supply voltage circuit of the turn signal switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 46
--
40
Replace the turn signal/hazard flasher. Refer to Hazard and Turn Signal Flasher Replacement .
Did you complete the replacement?
Go to Step 46
--
41
Replace the Daytime Running Lamps (DRL) control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .
Did you complete the repair?
Go to Step 46
42
Replace the turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .
Did you complete the repair?
Go to Step 46
--
43
Replace the inoperative turnlamp. Refer to the appropriate procedure:
• Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement
• Power Mirror Replacement in Doors.
Did you complete the repair?
Go to Step 46
--
44
Replace the inoperative turn signal bulb.
Did you complete the repair?
Go to Step 46
--
45
Replace the Instrument Cluster Panel (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.
Did you complete the repair?
Go to Step 46
--
46
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
×
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