Parking Brake Indicator Light Inoperative on the N/W Steering Deactivation Electrical Box

TASK 32-45-00-810-803-A
Parking Brake Indicator Light Inoperative on the N/W Steering Deactivation Electrical Box

1. Possible Causes

LAMP
ELEC BOX-N/W STEERING,DEACTIVATION [5GC]
wiring
CTL VALVE-PARK BRK,ELEC. [72GG]
CTL VALVE-PARK BRK, ELEC [102GG]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-45-00-710-001	Operational Check of the Parking Brake System
AMM 32-45-51-000-001	Removal of the Parking-Brake Electrical Control-Valve
AMM 32-45-51-400-001	Installation of the Parking-Brake Electrical Control-Valve
AMM 32-45-53-000-001	Removal of the Parking-Brake Electrical Control-Valve
AMM 32-45-53-400-001	Installation of the Parking-Brake Electrical Control-Valve
AMM 32-51-12-000-001	Removal of the Nose - Wheel Steering Electrical Deactivation - Box
AMM 32-51-12-400-001	Installation of the Nose - Wheel Steering Electrical Deactivation - Box
AMM 32-51-12-960-801	Replacement of the PARKING BRAKE Indicator Light on the Electrical Box (5GC)

3. Fault Confirmation
Subtask 32-45-00-710-051-A

A. Test
(1) Do the operational test of the parking brake system AMM 32-45-00-710-001.

4. Fault Isolation
Subtask 32-45-00-810-052-A ** ON A/C NOT FOR ALL

A. If the parking-brake indicator light is not on during the test:
(1) Push the lamp test on the NW-steering deactivation electrical-box (5GC).
(2) If the light is off during this test:
(a) Do a check for a ground signal at pin A/A of the NW-steering deactivation electrical-box (5GC).
1 If there is a ground signal:
a Do a check for 28VDC at pin A/B of the NW-steering deactivation electrical-box (5GC).
b If there is 28VDC:

Replace the LAMP on the electrical box (5GC) AMM 32-51-12-960-801.

c If the fault continues:

Replace ELEC BOX-N/W STEERING,DEACTIVATION [5GC] AMM 32-51-12-000-001 and AMM 32-51-12-400-001.

2 If there is no ground signal:
a Repair the wiring from the parking-brake electrical control-valve (72GG) pin A/D to the ground terminal.
b Repair the wiring from the parking-brake electrical control-valve (72GG) to theNW-steering deactivation electrical-box (5GC) pin A/E to pin A/A.

(3) If the light is on during this test:
(a) Do a check for a ground signal at pin A/A of the NW-steering deactivation electrical-box (5GC).
1 If there is no ground signal:
a Repair the wiring from the parking-brake electrical control-valve (72GG) pin A/D to the ground terminal.
b Repair the wiring from the parking-brake electrical control-valve (72GG) to the NW-steering deactivation electrical-box (5GC) pin A/E to pin A/A.

(4) If the fault continues:

Replace CTL VALVE-PARK BRK,ELEC. [72GG] AMM 32-45-51-000-001 AMM 32-45-51-400-001.

Subtask 32-45-00-810-052-C ** ON A/C NOT FOR ALL

Replace the LAMP on the electrical box (5GC) AMM 32-51-12-960-801.

c If the fault continues:

Replace ELEC BOX-N/W STEERING,DEACTIVATION [5GC] AMM 32-51-12-000-001 and AMM 32-51-12-400-001.

2 If there is no ground signal:
a Repair the wiring from the parking-brake electrical control-valve (102GG) pin A/4 to the ground terminal.
b Repair the wiring from the parking-brake electrical control-valve (102GG) to the NW-steering deactivation electrical-box (5GC) pin A/5 to pin A/A.
(3) If the light is on during this test:
(a) Do a check for a ground signal at pin A/A of the NW-steering deactivation electrical-box (5GC).
1 If there is no ground signal:
a Repair the wiring from the parking-brake electrical control-valve (102GG) pin A/4 to the ground terminal.
b Repair the wiring from the parking-brake electrical control-valve (102GG) to the NW-steering deactivation electrical-box (5GC) pin A/5 to pin A/A.
(4) If the fault continues:

Replace CTL VALVE-PARK BRK, ELEC [102GG] AMM 32-45-53-000-001 AMM 32-45-53-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:45 UTC