GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Epica 🢒 Body 🢒 Lighting Systems 🢒 Park, Tail and Side Marker Lamps Inoperative

Step

Action

Values

Yes

No

Notice: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals.

When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size.

1

Inspect the headlamps.

Do the headlamps work?

--

Go to Step 3

Go to Step 2

2

Repair the headlamps.

Are the rear combination lamps still inoperative?

--

Go to Step 3

System OK

3
  1. Turn the tail lamps and side turn signal lamps ON.
  2. Use a voltmeter to measure voltage at the bulb socket positive terminal.

Does voltage at the bulb socket measure within the specified range?

11-14 V

Go to Step 4

Go to Step 7

4

Connect an ohmmeter between ground and the lamp socket negative terminal.

Is the resistance equal to the specified value?

0 ohms

Go to Step 6

Go to Step 5

5

Repair the ground circuit for the lamps.

Is the repair complete?

--

System OK

--

6

Replace the faulty bulbs.

Is the repair complete?

--

System OK

--

7

Inspect fuses EF20 and EF21.

Are any of the fuses open?

--

Go to Step 8

Go to Step 9

8
  1. Inspect for a short circuit and repair it, if necessary.
  2. Replace the fuse.

Is the repair complete?

--

System OK

--

9
  1. Turn the headlamps ON.
  2. Measure the voltage at ISU connector terminal C8 for the left side tail lamp and side marker lamp, and ISU connector terminal C4 for the right side tail lamp and side marker lamp.

Does the voltage at the connector measure within the specified range?

11-14 V

Go to Step 11

Go to Step 10

10
  1. Inspect the ISU.
  2. Replace the ISU.

Is the repair complete?

--

System OK

--

11

Repair the open circuit between the fused EF20 and EF21 and the tail lamps and/or side turn signal lamps.

Is the repair complete?

--

System OK

--