B1644-REAR LEFT TURN LAMP 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 (Z910) GROUND CIRCUIT

(Z910) GROUND CIRCUIT OPEN

CHECK (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT

(L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT OPEN

(L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT SHORTED TO VOLTAGE

TOTALLY INTEGRATED POWER MODULE

Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, clear all DTC's.
Turn the Left Turn Signal on.
With the scan tool, read DTC's.

Does the scan tool display active: B1644-REAR LEFT TURN LAMP 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 - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2. CHECK (Z910) GROUND CIRCUITS

Turn the ignition off.
Disconnect the Left Rear Turn Signal Lamp assembly harness connector.
With a 12–volt test light connected to 12–volts, probe each (Z910) Ground circuit.

Does the test light illuminate brightly on each ground circuit?

Yes

Go To 4

No

Go To 3

3. (Z910) GROUND CIRCUIT OPEN

Measure the resistance of the appropriate (Z910) Ground circuit(s) at the Left Rear Turn Signal Lamp assembly 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 (Z910) Ground circuit(s) for an open.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4. CHECK (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT

Turn the ignition on.
With the Left Turn Signal still on and a 12–volt test light connected to ground, check the (L63) Left Rear Turn Signal Control circuit.

Does the test light blink brightly from on to off with the turn signal indicator?

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. (L63) LEFT TURN SIGNAL CONTROL CIRCUIT OPEN

Turn the ignition off.
Disconnect the TIPM C4 harness connector.
Measure the resistance of the (L63) Left Rear Turn Signal Control circuit between the Left Rear Tail Lamp assembly harness connector and the TIPM C4 harness connector.

Is the resistance below 10.0 ohms?

Yes

Go To 6

No

Repair the (L63) Left Rear Turn Signal Control circuit for an open.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

6. (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition on.
Measure for voltage on the (L63) Left Rear Turn Signal Control circuit.

Is there any voltage present?

Yes

Repair short to voltage on the (L63) Left Rear Turn Signal Control circuit.

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)