B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

When Monitored:
Continuously.
Set Condition:
When the Totally Integrated Power Module (TIPM) detects a HIGH condition.

Possible Causes

CHECK (Z904) GROUND CIRCUIT

(Z904) GROUND CIRCUIT OPEN

CHECK (L33) LEFT HIGH BEAM CONTROL CIRCUIT

(L33) LEFT HIGH BEAM CONTROL CIRCUIT OPEN

(L33) LEFT HIGH BEAM CONTROL CIRCUIT SHORT TO VOLTAGE

LEFT HIGH BEAM BULB

TOTALLY INTEGRATED POWER MODULE

Diagnostic Test

1. INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, clear all DTC's.
Turn the High Beam Lamps on.
With the scan tool, read DTC's.

Does the scan tool display active: B1634-LEFT HIGH BEAM CONTROL CIRCUIT HIGH?

Yes

Go To 2

No

The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
Perform the BODY VERIFICATION TEST — VER1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2. CHECK (Z904) GROUND CIRCUITS

Turn the ignition off.
Disconnect the Left High Beam Lamp harness connector.
With a 12–volt test light connected to 12–volts, probe each (Z904) Ground circuit.

Does the test light illuminate brightly on each ground circuit?

Yes

Go To 4

No

Go To 3

3. (Z904) GROUND CIRCUIT OPEN

Measure the resistance of the appropriate (Z904) Ground circuit(s) at the Left High Beam harness connector.

Is the resistance below 10.0 ohms?

Yes

Replace the Inoperative bulb in accordance with the Service Information.

Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Repair the appropriate (Z904) Ground circuit(s) for an open.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4. CHECK (L33) LEFT HIGH BEAM CONTROL CIRCUIT

Turn the ignition on.
With a 12–volt test light connected to ground, check the (L33) Left High Beam Control circuit.

Does the test light illuminate brightly with the headlamps switch turned on, and shut off with the headlamps turned off?

Yes

Replace the Inoperative bulb in accordance with the Service Information.

Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Go To 5

5. (L33) LEFT HIGH BEAM CONTROL CIRCUIT OPEN

Turn the ignition off.
Disconnect the TIPM C3 harness connector.
Measure the resistance of the (L33) Left High Beam Control Circuit between the Left Headlamp harness connector and the TIPM C3 harness connector.

Is the resistance below 10.0 ohms?

Yes

Go To 6

No

Repair the (L33) Left High Beam Control circuit for an open.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

6. (L33) LEFT HIGH BEAM CONTROL CIRCUIT SHORT TO VOLTAGE

Turn the ignition on.
Measure for voltage on the (L33) Left High Beam Control circuit.

Is there any voltage present?

Yes

Repair the (L33) Left High Beam Control circuit for a short to voltage.

Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)