Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Probe the inoperative rear trailer stop/turn lamp supply voltage circuit of the trailer tow connector with a test lamp that is connected to ground.
2. Place the turn signal switch in the TURN position of the inoperative side.

Does the test lamp illuminate and flash?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Do the vehicle's turn signals operate properly?

Go to Step 4

Go to Turn Signal Lamps and/or Indicators Inoperative

1. Disconnect the inoperative turn trailer relay.
2. Probe the turn signal lamp supply voltage circuit of the turn trailer relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate and flash?

Go to Step 5

Go to Step 9

Connect a test lamp between the turn signal lamp supply voltage circuit of the turn trailer relay and the ground circuit.

Does the test lamp illuminate and flash?

Go to Step 6

Go to Step 10

Probe the battery positive voltage circuit of the turn trailer relay with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 11

1. Install a 20-amp fused jumper wire between the battery positive voltage circuit of the turn trailer relay and the trailer stop/turn lamp supply voltage circuit.
2. Probe the stop/turn lamp supply voltage circuit of the trailer tow connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 12

Inspect for poor connections at the turn trailer relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 14

Go to Step 13

Repair the following in the turn signal lamp supply voltage circuit:

Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 14

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Repair an open or high resistance in the ground circuit of the turn trailer relay. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 14

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Repair the following in the battery positive voltage circuit of the turn trailer relay:

Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 14

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Repair the following in the stop/turn lamp supply voltage circuit of the turn trailer relay:

Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 14

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Replace the turn trailer relay. Refer to Relay Replacement.

Did you complete the replacement?

Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2