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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Side Marker Lamps Inoperative

Side Marker Lamps Inoperative Front Side Marker Lamps Inop

Step

Action

Value(s)

Yes

No

DEFINITION: LH or RH front side marker lamp is inoperative.

1

Did you perform the Exterior Lights Diagnostic System Check?

--

Go to Step  2

Go to Exterior Lights System Check

2
  1. Turn the headlamp switch to the PARK position.
  2. Determine which front side marker lamp is inoperative.

Is the LH front side marker lamp inoperative?

--

Go to Step  8

Go to Step  3

3
  1. Disconnect the RH front side marker lamp.
  2. Use a DMM in order to measure the voltage between terminal 2 of the RH front side marker lamp connector and a known good ground.

Does the voltage measure near the specified range?

B+

Go to Step  5

Go to Step  4

4
  1. Locate an open or a high resistance in power feed CKT RU3 from splice S102.
  2. Repair the open or the high resistance in CKT RU3.

Did you complete the repair?

--

Go to Step  13

--

5

Use the DMM in order to measure the resistance between terminal 1 of the RH front side marker lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step  7

Go to Step  6

6
  1. Locate an open or a high resistance in circuits  FU1, FU40 and/or FU20.
  2. Repair the open or the high resistance in circuits FU1, FU40 and/or FU20.
  3. If these circuits are OK, replace the RH stop/taillamp. Refer to Front Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step  13

--

7

Replace the RH front side marker lamp. Refer to Front Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step  13

--

8
  1. Disconnect the LH front side marker lamp.
  2. Use the DMM in order to measure the voltage between terminal 2 of the LH front side marker lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step  10

Go to Step  9

9
  1. Locate an open or a high resistance in power feed CKT RU2 from splice S102.
  2. Repair the open or the high resistance in powerfeed CKT RU2.

Did you complete the repair?

--

Go to Step  13

--

10

Use the DMM in order to measure the resistance between terminal 1 of the LH front side marker lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step  12

Go to Step  11

11
  1. Locate an open or a high resistance in circuits FM1, FM40 and/or FM20.
  2. Repair the open or the high resistance in circuits  FM1, FM40 and/or FM20.
  3. If these circuits are OK, replace the LH stop/taillamp. Refer to Rear Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step  13

--

12

Replace the LH front side marker lamp. Refer to Front Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step  13

--

13
  1. Connect all of the connectors and components that were previously disconnected.
  2. Verify that the LH and RH front side marker lamps turn on.

Do the LH and RH front side marker lamps turn on?

--

Go to Exterior Lights System Check

Go to Step 1

Side Marker Lamps Inoperative Rear Side Marker Lamps Inop

Step

Action

Value(s)

Yes

No

DEFINITION: LH or RH rear side marker lamp is inoperative.

1

Did you perform the Exterior Lights Diagnostic System Check?

--

Go to Step 2

Go to Exterior Lights System Check

2
  1. Turn the headlamp switch to the PARK position.
  2. Determine which rear side marker lamp is inoperative.

Is the LH rear side marker lamp inoperative?

--

Go to Step 8

Go to Step 3

3
  1. Disconnect the RH rear side marker lamp.
  2. Use a DMM in order to measure the voltage between terminal 1 of the RH rear side marker lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 5

Go to Step 4

4
  1. Locate an open or a high resistance in powerfeed circuits RA1 and/or RA20 from splice S260.
  2. Repair the open or the high resistance in circuits RA1 and/or RA20.

Did you complete the repair?

--

Go to Step 13

--

5

Use the DMM in order to measure the resistance between terminal 2 of the RH rear side marker lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 7

Go to Step 6

6
  1. Locate an open or a high resistance in circuits FU1 and/or FU30.
  2. Repair the open or the high resistance in circuits FU1 and/or FU30.
  3. If these circuits are OK, replace the RH stop/taillamp. Refer to Rear Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 13

--

7

Replace the RH rear side marker lamp. Refer to Rear Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 13

--

8
  1. Disconnect the LH rear side marker lamp.
  2. Use the DMM in order to measure the voltage between terminal 1 of the LH rear side marker lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 10

Go to Step 9

9
  1. Locate an open or a high resistance in powerfeed circuits RF1 and/or RF20 from S261.
  2. Repair the open or the high resistance in powerfeed circuits RF1 and/or RF20.

Did you complete the repair?

--

Go to Step 13

--

10

Use the DMM in order to measure the resistance between terminal 2 of the LH rear side marker lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 12

Go to Step 11

11
  1. Locate an open or a high resistance in circuits FM1 and/or FM30.
  2. Repair the open or the high resistance in circuits FM1 and/or FM30.
  3. If these circuits are OK, replace the LH stop/taillamp. Refer to Rear Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 13

--

12

Replace the LH rear side marker lamp. Refer to Rear Side Marker Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 13

--

13
  1. Connect all of the connectors and components that were previously disconnected.
  2. Verify that the LH and RH rear side marker lamps turn on.

Does the LH and RH rear side marker lamps turn on?

--

Go to Exterior Lights System Check

Go to Step 1