GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps Inoperative - High Beams

Step

Action

Yes

No

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2
  1. Turn the ignition switch to the ON position.
  2. Place the headlamp position switch to the HEAD position.
  3. Push the turn signal switch forward in order to turn on the high beam headlamps.

Are the high beam headlamps operating properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Determine if both high beam headlamps are inoperative.

Are both high beam headlamps inoperative?

Go to Step 5

Go to Step 4

4

Is the LH high beam headlamp inoperative?

Go to Step 12

Go to Step 7

5
  1. With the ignition switch in the ON position.
  2. With the headlamp position switch to the HEAD position.
  3. Push the turn signal switch forward in order to turn on the high beam headlamps.
  4. Backprobe the high beam On/Off circuit (M50) of the BCM connector C1 with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 34

Go to Step 6

6
  1. Disconnect the turn signal switch connector.
  2. Probe the high beam switch supply voltage circuit (B905) of the turn signal switch connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 20

Go to Step 30

7

Check the HI BEAM RH fuse for an open.

Is the HI BEAM RH fuse open?

Go to Step 28

Go to Step 8

8
  1. With the ignition switch in the ON position.
  2. With the headlamp position switch to the HEAD position.
  3. Push the turn signal switch forward in order to turn on the high beam headlamps.
  4. Disconnect the RH high beam headlamp
  5. Probe the RH high beam supply voltage circuit (M1) of the RH headlamp connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 10

9

Probe the RH high beam ground circuit (F11) of the RH headlamp connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 35

Go to Step 23

10
  1. Disconnect the RH high beam headlamp relay  K132 connector.
  2. Probe the coil side feed circuit (A827) of the RH headlamp relay K132 connector with a test lamp that is connected to a good ground.
  3. Probe the switch side feed circuit (A850) of the RH headlamp relay connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate for both tests?

Go to Step 11

Go to Step 29

11

Connect a fused jumper between the switch side feed circuit (A850) and the RH headlamp supply voltage circuit (M64) of the RH headlamp relay K132 connector.

Does the RH high beam headlamp illuminate?

Go to Step 21

Go to Step 22

12
  1. With the ignition switch to the ON position.
  2. Place the headlamp position switch to the HEAD position.
  3. Push the turn signal switch forward in order to turn on the high beam headlamps.
  4. Disconnect the LH high beam headlamp.
  5. Probe the LH high beam supply voltage circuit (M2) of the LH headlamp connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 14

13

Probe the LH high beam ground circuit (FM13) of the LH headlamp connector with a test lamp that is connected to B+.

Does the test lamp illuminate?

Go to Step 37

Go to Step 15

14
  1. Disconnect the daytime running lamp relay K131.
  2. Probe the switch side feed circuit (A10) of the DRL relay connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 16

Go to Step 25

15
  1. Disconnect the LH headlamp relay K73.
  2. Probe the coil side feed circuit (A832) of the LH headlamp relay K73 connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 17

Go to Step 26

16

Test the LH headlamp supply voltage circuit (M8, M2) for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 36

17

Probe the switch side ground feed circuit (F803) of the LH headlamp relay K73 connector with a test lamp that is connected to B+.

Does the test lamp illuminate?

Go to Step 18

Go to Step 24

18
  1. Connect the LH headlamp connector.
  2. Turn the headlamp switch to the HEAD position.
  3. Push the turn signal lever away from you in order to turn on the high beam headlamps.
  4. Connect a fused jumper between the switch side ground feed circuit (F803) and the LH high beam ground circuit (FM19) of the LH headlamp relay K73 connector.

Does the LH high beam headlamp illuminate?

Go to Step 19

Go to Step 27

19

Test for an open or a high resistance in the control circuit (M70) of the LH high beam relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 32

20

Test the high beam On/Off circuit (M50, M3) for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 33

21

Test for an open or a high resistance in the control circuit (M62) of the RH high beam relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 31

22

Repair the open or a high resistance in the supply voltage circuit (M64, M1) of the RH high beam lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

23

Repair the open or a high resistance in the ground circuit (F11) of the RH high beam . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

24

Repair the open or a high resistance in the switch side ground feed circuit (F803) of the LH headlamp relay K73 . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

25

Repair the open or a high resistance in the switch side feed circuit (A10) of the DRL relay . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

26

Repair the open or a high resistance in the coil side feed circuit (A832) of the LH headlamp relay K73. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

27

Repair the open or a high resistance in the ground circuit (FM13, FM19) of the LH high beam. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

28

Locate and repair the short to ground in one of the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems:

    • The RH headlamp relay switch side feed circuit (A850)
    • The RH headlamp relay coil side feed circuit (A827)
    • The RH high beam supply voltage circuit (M64, M1)
    • DRL series circuit (M65)
    • LH high beam ground circuit (FM13, FM19)

Did you complete the repair?

Go to Step 38

--

29

Locate and repair an open or high resistance in one of the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems:

    • The RH headlamp relay switch side feed circuit (A850)
    • The RH headlamp relay coil side feed circuit (A827)

Did you complete the repair?

Go to Step 38

--

30

Repair the open or a high resistance in the high beam switch supply circuit (B905, B800) . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

31

Replace the RH headlamp relay K132.

Is the replacement complete?

Go to Step 38

--

32

Replace the LH headlamp relay K73.

Is the replacement complete?

Go to Step 38

--

33

Replace the turn signal switch. Refer to Turn Signal Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Is the replacement complete?

Go to Step 38

--

34

Inspect the BCM connector C1 for a poor connection. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Is the repair or replacement complete?

Go to Step 38

--

35

Replace the RH high beam headlamp. Refer to Headlamp Capsule Replacement .

Is the replacement complete?

Go to Step 38

--

36

Replace the daytime running lamps relay.

Is the replacement complete?

Go to Step 38

--

37

Replace the LH high beam headlamp. Refer to Headlamp Capsule Replacement .

Is the replacement complete?

Go to Step 38

--

38
  1. Connect all connectors and components that were disconnected.
  2. Verify that the high beam headlamps operate properly.

Do the high beam headlamps operate properly?

System OK

Go to Step 2