The fault code P0AA6 – hybrid battery isolation fault is what the name suggests the wiring between units is not good, but there are sub codes and how to quickly identify what to do
SUB CODES / INF Codes
526 – vehicles orange cables are shorting somewhere water in harness plug ( corrosion ) clean harness plugs and check resistance should be in the 3 M,Ohms and higher region so the book says i usually see 30m ohms or higher or nothing at all ( ultimately )
611 – AC Compressor is shorting out ( most common )
612 – Battery is shorting out to the frame
613 – Electric Motors Shorting
614 – Invertor is shorting

Where to Find the Subcodes ?
Quick Answer is Tech Stream in the freeze frames for the Fault

Some show in the live data ( Year model Pending ).
Search for the PID ( Detail Codes 1 though 5 ) this will show you the results of the tests carried out every time you start the car, or delete the fault code it will run the tests again.

* quick hint * if you turn on the a/c and its the compressor is shorted. the check battery sign will come up on cluster quicker. and if fuse blown in inverter you will get the B1498 Fault listed below.

B1498 – Communication Malfunction (A-C invertor local)
what they don’t tell you is that it could be the fuse in the Inverter Take the cap off and look at the fuse white crystals it should still have ohm resistance to work

The dash globes are as follows

T3

not too sure where it fits

T4

T4.2 –

Flush mount globe usually fitted to hard circuit board, always the globe you don’t have as the globe is not replaceable easily with out the plastic base.

fitted to Toyota’s clocks Ford falcon clocks and instrument clusters as a back light

T5. Normally replaceable

DIAGNOSTIC CHARTS – V6 Engines,

ABS DIAGNOSTIC TROUBLE CODE TABLE
DTC CODE DESCRIPTION
12 No Fault
21 Front Right Wheel Speed Sensor Incorrect Signal
23 Front Right Wheel Speed Sensor Short Circuit or Open Circuit
25 Front Left Wheel Speed Sensor Incorrect Signal
27 Front Left Wheel Speed Sensor Short Circuit or Open Circuit
28 Wheel Speed Sensor Frequency Error
31 Rear Right Wheel Speed Sensor Incorrect Signal
33 Rear Right Wheel Speed Sensor Short Circuit or Open Circuit
35 Rear Left Wheel Speed Sensor Incorrect Signal
37 Rear Left Wheel Speed Sensor Short Circuit or Open Circuit
41 Front Right Inlet Valve Solenoid Fault
42 Front Right Outlet Valve Solenoid Fault
45 Front Left Inlet Valve Solenoid Fault
46 Front Left Outlet Valve Solenoid Fault
55 Rear Axle Inlet Valve Solenoid Fault
56 Rear Axle Outlet Valve Solenoid Fault
61 Pump Motor or Relay Fault
63 Valve Solenoid Relay Circuit Fault
67 Stop Lamp Switch Circuit Fault
71 Control Module Internal Fault
85 System Voltage Too Low

DIAGNOSTIC CHARTS – GEN III V8 Engine, V8 – WITH THROTTLE RELAXER

ABS/TCS DIAGNOSTIC TROUBLE CODE TABLE
DTC CODE DESCRIPTION
12 No Fault
21 Front Right Wheel Speed Sensor Incorrect Signal
23 Front Right Wheel Speed Sensor Short Circuit or Open Circuit
25 Front Left Wheel Speed Sensor Incorrect Signal
27 Front Left Wheel Speed Sensor Short Circuit or Open Circuit
28 Wheel Speed Sensor Frequency Error
31 Rear Right Wheel Speed Sensor Incorrect Signal
33 Rear Right Wheel Speed Sensor Short Circuit or Open Circuit
35 Rear Left Wheel Speed Sensor Incorrect Signal
37 Rear Left Wheel Speed Sensor Short Circuit or Open Circuit
41 Front Right Inlet Valve Solenoid Fault
42 Front Right Outlet Valve Solenoid Fault
45 Front Left Inlet Valve Solenoid Fault
46 Front Left Outlet Valve Solenoid Fault
47 Priming Valve Solenoid Fault
48 Switching Valve Solenoid Fault
51 Rear Right Inlet Valve Solenoid Fault
52 Rear Right Outlet Valve Solenoid Fault
55 Rear Left Inlet Valve Solenoid Fault
56 Rear Left Outlet Valve Solenoid Fault
58 Throttle Relaxer PWM (Pulse Width Modulation) Interface Fault
61 Pump Motor or Relay Fault
62 RPM Signal Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections
63 Valve Solenoid Relay Circuit Fault
64 Throttle Relaxer Control Module Position Fault
65 Throttle Relaxer Motor Fault
66 Throttle Relaxer Control Fault
67 Stop Lamp Switch Circuit Fault
68 TPS (Throttle Position Sensor) Monitoring Fault
71 Control Module Internal Fault
72 Serial Data Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections)
73 Spark Retard Monitoring Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections)
73 Requested Torque Circuit Fault – V6 Engines Only
74 Actual Torque Circuit Fault – V6 Engines Only
78 Incorrect Option Coding
85 System Voltage Too Low